Re: vnlur_proc lockups under high disk I/O
Matthew Dillon wrote:
> :I've attached the dmesg output. I'm running memory and disk diagnostics
> :as it's strange that its only just started. (I haven't run a buildworld
> :in a week but only noticed the problem yesterday.)
> :
> :Extracting a large tar file while the CPU is under load nearly always
> :triggers the problem. It's as if disk IO operations take longer and
> :longer until they eventually time out locking the machine. You can watch
> :the disk activity led go from constant to briefly flashing at increasing
> :intervals.
> :
> :Buildworlds also gradually slow to a crawl but so far haven't resulted
> :in the vnlru_proc errors.
> :
> :The first time it happened I was running "make -j 4 buildworld" on the
> :console and extracting the pkgsrc tarball to /usr/pkgsrc via a SSH session.
> :
> :Regards
> :
> :Gary
>
> What is likely happening is that the recycler is trying to flush out vnodes
> related to things other then the hard drive, and one of those things is
> causing it to stall.
>
> Observe your other mounts carefully. What other mounts do you have?
>
> -Matt
I have a semi-production machine running stable from a few months ago.
The vnode related sysctl values on this machine are;
kern.maxvnodes = 36053
kern.minvnodes = 9008
However on the machine I'm having problems with they are; (current stable)
kern.maxvnodes = 16754
kern.minvnodes = 4188
I've added the previous settings to /etc/sysctl.conf and the problems
have not reoccurred. I can now run "cd /usr/pkgsrc && cvs -q update -dP"
without problems, previously this would result in a lockup without failure.
I only have standard mounts and am only working within /usr.
df
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/ad2s1a 254063 47193 186545 20% /
/dev/ad2s1d 254063 307 233431 0% /var
/dev/ad2s1e 254063 8 233730 0% /tmp
/dev/ad2s1f 36606155 346959 33330704 1% /usr
procfs 4 4 0 100% /proc
Do you still want a kernel core?
Regards
Gary
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