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e4fc250c15
Non-SMP, i386-only, no polling in the idle loop at the moment.
To use this code you must compile a kernel with
options DEVICE_POLLING
and at runtime enable polling with
sysctl kern.polling.enable=1
The percentage of CPU reserved to userland can be set with
sysctl kern.polling.user_frac=NN (default is 50)
while the remainder is used by polling device drivers and netisr's.
These are the only two variables that you should need to touch. There
are a few more parameters in kern.polling but the default values
are adequate for all purposes. See the code in kern_poll.c for
more details on them.
Polling in the idle loop will be implemented shortly by introducing
a kernel thread which does the job. Until then, the amount of CPU
dedicated to polling will never exceed (100-user_frac).
The equivalent (actually, better) code for -stable is at
http://info.iet.unipi.it/~luigi/polling/
and also supports polling in the idle loop.
NOTE to Alpha developers:
There is really nothing in this code that is i386-specific.
If you move the 2 lines supporting the new option from
sys/conf/{files,options}.i386 to sys/conf/{files,options} I am
pretty sure that this should work on the Alpha as well, just that
I do not have a suitable test box to try it. If someone feels like
trying it, I would appreciate it.
NOTE to other developers:
sure some things could be done better, and as always I am open to
constructive criticism, which a few of you have already given and
I greatly appreciated.
However, before proposing radical architectural changes, please
take some time to possibly try out this code, or at the very least
read the comments in kern_poll.c, especially re. the reason why I
am using a soft netisr and cannot (I believe) replace it with a
simple timeout.
Quick description of files touched by this commit:
sys/conf/files.i386
new file kern/kern_poll.c
sys/conf/options.i386
new option
sys/i386/i386/trap.c
poll in trap (disabled by default)
sys/kern/kern_clock.c
initialization and hardclock hooks.
sys/kern/kern_intr.c
minor swi_net changes
sys/kern/kern_poll.c
the bulk of the code.
sys/net/if.h
new flag
sys/net/if_var.h
declaration for functions used in device drivers.
sys/net/netisr.h
NETISR_POLL
sys/dev/fxp/if_fxp.c
sys/dev/fxp/if_fxpvar.h
sys/pci/if_dc.c
sys/pci/if_dcreg.h
sys/pci/if_sis.c
sys/pci/if_sisreg.h
device driver modifications
90 lines
3.4 KiB
C
90 lines
3.4 KiB
C
/*
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* Copyright (c) 1980, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)netisr.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#ifndef _NET_NETISR_H_
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#define _NET_NETISR_H_
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/*
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* The networking code runs off software interrupts.
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*
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* You can switch into the network by doing splnet() and return by splx().
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* The software interrupt level for the network is higher than the software
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* level for the clock (so you can enter the network in routines called
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* at timeout time).
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*/
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/*
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* Each ``pup-level-1'' input queue has a bit in a ``netisr'' status
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* word which is used to de-multiplex a single software
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* interrupt used for scheduling the network code to calls
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* on the lowest level routine of each protocol.
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*/
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#define NETISR_POLL 0 /* polling callback, must be first */
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#define NETISR_IP 2 /* same as AF_INET */
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#define NETISR_NS 6 /* same as AF_NS */
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#define NETISR_ATALK 16 /* same as AF_APPLETALK */
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#define NETISR_ARP 18 /* same as AF_LINK */
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#define NETISR_IPX 23 /* same as AF_IPX */
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#define NETISR_USB 25 /* USB soft interrupt */
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#define NETISR_PPP 27 /* PPP soft interrupt */
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#define NETISR_IPV6 28 /* same as AF_INET6 */
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#define NETISR_NATM 29 /* same as AF_NATM */
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#define NETISR_ATM 30 /* same as AF_ATM */
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#define NETISR_NETGRAPH 31 /* same as AF_NETGRAPH */
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#ifndef LOCORE
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#ifdef _KERNEL
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void legacy_setsoftnet __P((void));
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extern volatile unsigned int netisr; /* scheduling bits for network */
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extern void (*netisrs[32]) __P((void));
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#define schednetisr(anisr) do { \
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atomic_set_rel_int(&netisr, 1 << (anisr)); \
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legacy_setsoftnet(); \
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} while (0)
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typedef void netisr_t __P((void));
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int register_netisr __P((int, netisr_t *));
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int unregister_netisr __P((int));
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#endif
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#endif
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#endif
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