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- boot-time size the ipv4 flowtable and the maximum number of flows
- increase flow cleaning frequency and decrease flow caching time when near the flow limit - stop allocating new flows when within 3% of maxflows don't start allocating again until below 12.5% MFC after: 7 days
This commit is contained in:
Kip Macy
parent
1a23373ceb
commit
3059584e2a
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=205488
@ -155,30 +155,33 @@ struct flowtable_stats {
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uint64_t ft_frees;
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uint64_t ft_hits;
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uint64_t ft_lookups;
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} __aligned(128);
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} __aligned(CACHE_LINE_SIZE);
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struct flowtable {
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struct flowtable_stats ft_stats[MAXCPU];
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int ft_size;
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int ft_lock_count;
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uint32_t ft_flags;
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uint32_t ft_udp_idle;
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uint32_t ft_fin_wait_idle;
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uint32_t ft_syn_idle;
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uint32_t ft_tcp_idle;
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char *ft_name;
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fl_lock_t *ft_lock;
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fl_lock_t *ft_unlock;
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fl_rtalloc_t *ft_rtalloc;
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/*
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* XXX need to pad out
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*/
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struct mtx *ft_locks;
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union flentryp ft_table;
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bitstr_t *ft_masks[MAXCPU];
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bitstr_t *ft_tmpmask;
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struct flowtable *ft_next;
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} __aligned(128);
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uint32_t ft_count __aligned(CACHE_LINE_SIZE);
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uint32_t ft_udp_idle __aligned(CACHE_LINE_SIZE);
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uint32_t ft_fin_wait_idle;
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uint32_t ft_syn_idle;
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uint32_t ft_tcp_idle;
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boolean_t ft_full;
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} __aligned(CACHE_LINE_SIZE);
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static struct proc *flowcleanerproc;
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static VNET_DEFINE(struct flowtable *, flow_list_head);
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@ -191,9 +194,11 @@ static VNET_DEFINE(uma_zone_t, flow_ipv6_zone);
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#define V_flow_ipv4_zone VNET(flow_ipv4_zone)
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#define V_flow_ipv6_zone VNET(flow_ipv6_zone)
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static struct cv flowclean_cv;
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static struct mtx flowclean_lock;
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static uint32_t flowclean_cycles;
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static uint32_t flowclean_freq;
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#ifdef FLOWTABLE_DEBUG
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#define FLDPRINTF(ft, flags, fmt, ...) \
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@ -230,7 +235,7 @@ static VNET_DEFINE(int, flowtable_syn_expire) = SYN_IDLE;
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static VNET_DEFINE(int, flowtable_udp_expire) = UDP_IDLE;
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static VNET_DEFINE(int, flowtable_fin_wait_expire) = FIN_WAIT_IDLE;
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static VNET_DEFINE(int, flowtable_tcp_expire) = TCP_IDLE;
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static VNET_DEFINE(int, flowtable_nmbflows) = 4096;
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static VNET_DEFINE(int, flowtable_nmbflows);
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static VNET_DEFINE(int, flowtable_ready) = 0;
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#define V_flowtable_enable VNET(flowtable_enable)
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@ -905,6 +910,61 @@ flowtable_set_hashkey(struct flentry *fle, uint32_t *key)
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hashkey[i] = key[i];
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}
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static struct flentry *
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flow_alloc(struct flowtable *ft)
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{
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struct flentry *newfle;
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uma_zone_t zone;
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newfle = NULL;
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zone = (ft->ft_flags & FL_IPV6) ? V_flow_ipv6_zone : V_flow_ipv4_zone;
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newfle = uma_zalloc(zone, M_NOWAIT | M_ZERO);
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if (newfle != NULL)
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atomic_add_int(&ft->ft_count, 1);
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return (newfle);
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}
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static void
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flow_free(struct flentry *fle, struct flowtable *ft)
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{
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uma_zone_t zone;
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zone = (ft->ft_flags & FL_IPV6) ? V_flow_ipv6_zone : V_flow_ipv4_zone;
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atomic_add_int(&ft->ft_count, -1);
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uma_zfree(zone, fle);
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}
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static int
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flow_full(struct flowtable *ft)
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{
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boolean_t full;
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uint32_t count;
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full = ft->ft_full;
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count = ft->ft_count;
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if (full && (count < (V_flowtable_nmbflows - (V_flowtable_nmbflows >> 3))))
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ft->ft_full = FALSE;
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else if (!full && (count > (V_flowtable_nmbflows - (V_flowtable_nmbflows >> 5))))
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ft->ft_full = TRUE;
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if (full && !ft->ft_full) {
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flowclean_freq = 4*hz;
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if ((ft->ft_flags & FL_HASH_ALL) == 0)
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ft->ft_udp_idle = ft->ft_fin_wait_idle =
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ft->ft_syn_idle = ft->ft_tcp_idle = 5;
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cv_broadcast(&flowclean_cv);
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} else if (!full && ft->ft_full) {
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flowclean_freq = 20*hz;
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if ((ft->ft_flags & FL_HASH_ALL) == 0)
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ft->ft_udp_idle = ft->ft_fin_wait_idle =
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ft->ft_syn_idle = ft->ft_tcp_idle = 30;
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}
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return (ft->ft_full);
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}
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static int
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flowtable_insert(struct flowtable *ft, uint32_t hash, uint32_t *key,
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uint32_t fibnum, struct route *ro, uint16_t flags)
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@ -912,12 +972,10 @@ flowtable_insert(struct flowtable *ft, uint32_t hash, uint32_t *key,
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struct flentry *fle, *fletail, *newfle, **flep;
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struct flowtable_stats *fs = &ft->ft_stats[curcpu];
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int depth;
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uma_zone_t flezone;
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bitstr_t *mask;
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uint8_t proto;
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flezone = (flags & FL_IPV6) ? V_flow_ipv6_zone : V_flow_ipv4_zone;
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newfle = uma_zalloc(flezone, M_NOWAIT | M_ZERO);
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newfle = flow_alloc(ft);
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if (newfle == NULL)
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return (ENOMEM);
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@ -948,9 +1006,8 @@ flowtable_insert(struct flowtable *ft, uint32_t hash, uint32_t *key,
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* or we lost a race to insert
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*/
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FL_ENTRY_UNLOCK(ft, hash);
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uma_zfree((newfle->f_flags & FL_IPV6) ?
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V_flow_ipv6_zone : V_flow_ipv4_zone, newfle);
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flow_free(newfle, ft);
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if (flags & FL_OVERWRITE)
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goto skip;
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return (EEXIST);
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@ -1147,7 +1204,7 @@ flowtable_lookup(struct flowtable *ft, struct sockaddr_storage *ssa,
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}
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FL_ENTRY_UNLOCK(ft, hash);
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uncached:
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if (flags & FL_NOAUTO)
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if (flags & FL_NOAUTO || flow_full(ft))
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return (NULL);
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fs->ft_misses++;
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@ -1325,7 +1382,7 @@ flowtable_alloc(char *name, int nentry, int flags)
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*
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*/
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static void
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fle_free(struct flentry *fle)
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fle_free(struct flentry *fle, struct flowtable *ft)
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{
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struct rtentry *rt;
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struct llentry *lle;
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@ -1334,8 +1391,7 @@ fle_free(struct flentry *fle)
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lle = __DEVOLATILE(struct llentry *, fle->f_lle);
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RTFREE(rt);
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LLE_FREE(lle);
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uma_zfree((fle->f_flags & FL_IPV6) ?
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V_flow_ipv6_zone : V_flow_ipv4_zone, fle);
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flow_free(fle, ft);
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}
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static void
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@ -1426,7 +1482,7 @@ flowtable_free_stale(struct flowtable *ft, struct rtentry *rt)
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flefreehead = fle->f_next;
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count++;
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fs->ft_frees++;
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fle_free(fle);
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fle_free(fle, ft);
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}
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if (V_flowtable_debug && count)
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log(LOG_DEBUG, "freed %d flow entries\n", count);
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@ -1518,7 +1574,7 @@ flowtable_cleaner(void)
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*/
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mtx_lock(&flowclean_lock);
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cv_broadcast(&flowclean_cv);
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cv_timedwait(&flowclean_cv, &flowclean_lock, 10*hz);
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cv_timedwait(&flowclean_cv, &flowclean_lock, flowclean_freq);
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mtx_unlock(&flowclean_lock);
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}
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}
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@ -1548,6 +1604,7 @@ static void
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flowtable_init_vnet(const void *unused __unused)
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{
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V_flowtable_nmbflows = 1024 + maxusers * 64 * mp_ncpus;
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V_flow_ipv4_zone = uma_zcreate("ip4flow", sizeof(struct flentry_v4),
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NULL, NULL, NULL, NULL, 64, UMA_ZONE_MAXBUCKET);
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V_flow_ipv6_zone = uma_zcreate("ip6flow", sizeof(struct flentry_v6),
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@ -1556,7 +1613,7 @@ flowtable_init_vnet(const void *unused __unused)
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uma_zone_set_max(V_flow_ipv6_zone, V_flowtable_nmbflows);
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V_flowtable_ready = 1;
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}
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VNET_SYSINIT(flowtable_init_vnet, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE,
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VNET_SYSINIT(flowtable_init_vnet, SI_SUB_SMP, SI_ORDER_ANY,
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flowtable_init_vnet, NULL);
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static void
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@ -1567,8 +1624,9 @@ flowtable_init(const void *unused __unused)
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mtx_init(&flowclean_lock, "flowclean lock", NULL, MTX_DEF);
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EVENTHANDLER_REGISTER(ifnet_departure_event, flowtable_flush, NULL,
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EVENTHANDLER_PRI_ANY);
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flowclean_freq = 20*hz;
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}
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SYSINIT(flowtable_init, SI_SUB_KTHREAD_INIT, SI_ORDER_ANY,
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SYSINIT(flowtable_init, SI_SUB_SMP, SI_ORDER_MIDDLE,
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flowtable_init, NULL);
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@ -327,8 +327,20 @@ ip_init(void)
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"error %d\n", __func__, i);
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#ifdef FLOWTABLE
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TUNABLE_INT_FETCH("net.inet.ip.output_flowtable_size",
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&V_ip_output_flowtable_size);
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if (TUNABLE_INT_FETCH("net.inet.ip.output_flowtable_size",
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&V_ip_output_flowtable_size)) {
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if (V_ip_output_flowtable_size < 256)
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V_ip_output_flowtable_size = 256;
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if (!powerof2(V_ip_output_flowtable_size)) {
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printf("flowtable must be power of 2 size\n");
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V_ip_output_flowtable_size = 2048;
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}
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} else {
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/*
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* round up to the next power of 2
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*/
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V_ip_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1);
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}
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V_ip_ft = flowtable_alloc("ipv4", V_ip_output_flowtable_size, FL_PCPU);
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#endif
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