spaces which cross a segment boundry in the page table. pmap_kextract()
is not designed for access to the user space portion of the page
table and cannot handle the null-page-directory-entry case.
The fix is to have vm_fault_quick() return a success or failure which
is then used to avoid calling pmap_kextract().
This whole idea isn't going to work until somebody makes the bus/kld
code smarter. The idea here is to change the module's internal name
from "foo" to "if_foo" so that ifconfig can tell a network driver from
a non-network one. However doing this doesn't work correctly no matter
how you slice it. For everything to work, you have to change the name
in both the driver_t struct and the DRIVER_MODULE() declaration. The
problems are:
- If you change the name in both places, then the kernel thinks that
the device's name is now "if_foo", so you get things like:
if_foo0: <FOO ethernet> irq foo at device foo on pcifoo
if_foo0: Ethernet address: foo:foo:foo:foo:foo:foo
This is bogus. Now the device name doesn't agree with the logical
interface name. There's no reason for this, and it violates the
principle of least astonishment.
- If you leave the name in the driver_t struct as "foo" and only
change the names in the DRIVER_MODULE() declaration to "if_foo" then
attaching drivers to child devices doesn't work because the names don't
agree. This breaks miibus: drivers that need to have miibuses and PHY
drivers attached never get them.
In other words: damned if you do, damned if you don't.
This needs to be thought through some more. Since the drivers that
use miibus are broken, I have to change these all back in order to
make them work again. Yes this will stop ifconfig from being able
to demand load driver modules. On the whole, I'd rather have that
than having the drivers not work at all.
usually cleared by a successful selection, but there is no guarantee
that a future successful selection will ever occur (e.g. empty bus).
The driver never looks at SELINGO, but the busy LED does, so this
change has the cosmetic effect of fixing the rare instance where the
busy LED was left on, confusing the user.
aic7xxx parts. This problem could result in data corruption
during periods of my PCI bus load by busmasters other than the
aic7xxx.
Many thanks to Andrew Gallatin <gallatin@cs.duke.edu> for characterizing
the symptoms of this problem and testing this fix.
adjust the bp->b_bcount the same way for unlabeled VN access as dscheck
does for labeled access.
We also increase the block size to at least 8K for efficiency.
Reviewed by: Tor.Egge@fast.no
improperly ignored the B_INVAL flag when acting on the B_ERROR.
If both B_INVAL and B_ERROR are set the buffer is typically out of the
underlying device's block range and must be destroyed. If only B_ERROR
is set (for a write), a write error occured and operation remains as it
was before: the buffer must be redirtied to avoid corrupting the
filesystem state.
Reviewed by: David Greenman <dg@root.com>
Submitted by: Tor.Egge@fast.no
manpage does not describe the builtin wait command provided by either
of the standard shells. There is already an entry for wait.1 in the
builtins.1 MLINKS list.
we're about to operate on, try to load one. Don't complain if the
load fails, and always press on regardless (there may not be a module
suitable or required).
With the renaming of the PCI ethernet driver modules and the addition
of appropriate miibus dependancies on those modules that need it, it is
now no longer necessary to compile many ethernet drivers into the kernel;
they will be loaded on demand the first time they are ifconfig'ed.
Inspiration from: mount
Reviewed by: obrien
It is about 2.5 microseconds or roughly 3 times faster to use this
"PIIX" timecounter than the "i8254" timecounter. Resolution is
also 3 times better.
The code cheats and don't register the PCI device, because other pieces
of code want to use it too.
Originally spotted by: msmith
strategy used in the 3Com Linux driver. The new strategy is to use transmit
descriptor polling -- that is, the NIC polls the descriptors to see when
new packets are available for transmission. The advantage to the new scheme
is that no register accesses are needed in the transmit routine. The old
scheme requires several register accesses to stall the TX engine, update the
TX DMA list pointer register, then unstall the TX engine. Hopefully the new
scheme will provide improved transmit performance with less CPU overhead.
This only affects the 3c90xB or 3c90xC cards, not the 3c90x cards. This
means the original 3c900 and 3c905 cards are unaffected. Newer cards include
the 3c900B series, the 3c905B, 3c980, 3c980B, 3c905C and 3c905C, and the
3cSOHO100-TX OfficeConnect.
close PR #13757, however I'm waiting on user feedback before declaring the
PR officially closed. Among other things, this improves UDP transmit
performance, and tx underruns are now detected and the TX start threshold
adjusted accordingly.
far-reaching in fd-land, so you'll want to consult the code for
changes. The biggest change is that now, you don't use
fp->f_ops->fo_foo(fp, bar)
but instead
fo_foo(fp, bar),
which increments and decrements the fp refcount upon entry and exit.
Two new calls, fhold() and fdrop(), are provided. Each does what it
seems like it should, and if fdrop() brings the refcount to zero, the
fd is freed as well.
Thanks to peter ("to hell with it, it looks ok to me.") for his review.
Thanks to msmith for keeping me from putting locks everywhere :)
Reviewed by: peter
Matthew Dillon
Bill Paul
Justin T. Gibbs
Wes Peters
Poul-Henning Kamp
Mitsuru IWASAKI
Mark Murray
Doug Rabson
Alexey Zelkin
Ruslan Ermilov
Sheldon Hearn
Mike Smith
David E. O'Brien
Brian Somers
Peter Wemm
Brian Feldman