underlying the POSIX fifo implementation. In 6.x/7.x, fifo access is
moved from the VFS layer, where it was serialized using the vnode
lock, to the file descriptor layer, where access is protected by a
reference count but not serialized. This exposed socket buffer
locking to high levels of parallelism in specific fifo workloads, such
as make -j 32, which expose as yet unresolved socket buffer bugs.
fi_sx re-adds serialization about the read and write routines,
although not paths that simply test socket buffer mbuf queue state,
such as the poll and kqueue methods. This restores the extra locking
cost previously present in some cases, but is an effective workaround
for the instability that has been experienced. This workaround should
be removed once the bug in socket buffer handling has been fixed.
Reported by: kris, jhb, Julien Gabel <jpeg at thilelli dot net>,
Peter Holm <peter at holm dot cc>, others
MFC after: 3 days
chips where setting the FAILDIS bit is not effective. While here,
try again to make it clear that reported parity errors indicate
a failure of some PCI device *other than* the aic7xxx controller.
timer reset rather than the timer of an SCB still pending on the
controller after recovery completed. This should correct timeout
loops seen in the field.
copied mbuf, which keeps the IP header 32-bit aligned. This copied mbuf is
reinjected back into ether_input and off to the IP routines.
Reported and tested by: Peter van Dijk
Approved by: mlaier (mentor)
MFC after: 3 days
a thread holding critical resource, e.g mutex or other implicit
synchronous flags. Give thread which exceeds nice threshold a minimum
time slice.
PR: kern/86087
has been removed. It has been replaced by hw.pci.do_power_nodriver
and hw.pci.do_power_resume. The former defaults to 0 while the latter
defaults to 1.
When do_powerstate was set to 0, it broke suspend/resume for a lot of
people as an unintended consequence. This change will only affect the
areas that were intended to affect. This change will have no effect on
servers, but will help laptops quite a bit.
MFC After: 3 days.
NULL. The NFS client expects that a thread will always be present for a
VOP so that it can check for signal conditions, and will dereference a
NULL pointer if one isn't present.
MFC after: 3 days
I'm not sure this is the right thing to do, but at least I don't panic
anymore when swapping on a NFS file without using md(4).
X-MFC after: proper review
- Rearrange code so that in a case of failure the affected
route is not changed. Otherwise, a bogus rtentry will be
left and later rt_check() can recurse on its lock. [1]
- Remove comment about protocol cloning.
- Fix two places where rtentry mutex was recursed on, because
accessed via two different pointers, that were actually pointing
to the same rtentry in some cases. [1]
- Return EADDRINUSE instead of bogus EDQUOT, in case when gateway
uses the same route. [2]
Reported & tested by: ps, Andrej Zverev <az inec.ru> [1]
PR: kern/64090 [2]
The FXP_SCR_FLOWCONTROL registers is at offset 0x19, but 2 bytes wide.
It cannot be read as a word without causing a panic on architectures
that enforce strict alignment.
MFC after: 3 days
nor uprintf() is believed to perform tsleep() or msleep() as written,
as ttycheckoutq() is called with '0' as its sleep argument.
Remove recently added WITNESS warnings for sleep as the comment was
incorrect. This should silence a warning from the nfs_timer() code.
Discussed with: bde
