10-STABLE hangups frequently

[Henrik Lidström]

On 02/07/16 16:24, Henri Hennebert wrote:
> On 02/03/2016 02:03, Hajimu UMEMOTO wrote:
>> Hi,
>>
>>>>>>> On Wed, 3 Feb 2016 07:07:38 +1100
>>>>>>> Peter Jeremy <peter at rulingia.com> said:
>> peter> As others have said, you need to provide lots more detail on your
>> peter> configuration.
>>
>> CPU: AMD Athlon(tm) 64 Processor 3500+
>> Memory: 4GB
>> HDD: 3TB
>>
>> I'm using ZFS only setup.
>>
>> peter> There were no problems at r290231 but after I upgraded to r295005, I
>> peter> started seeing "out of swap" errors and hangs during the periodic
>> peter> daily runs.  I'm not seeing this on 1GB instances - though they are
>> peter> all running UFS.
>>
>> r292875 runs well:
>>
>> FreeBSD asuka.mahoroba.org 10.2-STABLEFreeBSD 10.2-STABLE #5 r292875: Tue Feb  2 07:08:29 JST 2016 root at asuka.mahoroba.org:/usr/obj/usr/src/sys/ASUKA  amd6
>>
>> r292895 hangs:
>>
>> FreeBSD asuka.mahoroba.org 10.2-STABLE FreeBSD 10.2-STABLE #6 r292895: Tue Feb  2 10:17:28 JST 2016 root at asuka.mahoroba.org:/usr/obj/usr/src/sys/ASUKA  amd64
>>
>> I tried latest stable (r295137) with the sys/kern/vfs_subr.c part of
>> r292895 reverted, and it seems running well, here:
>>
>> FreeBSD asuka.mahoroba.org 10.3-PRERELEASE FreeBSD 10.3-PRERELEASE #0 r295137M: Tue Feb  2 20:39:11 JST 2016     root at asuka.mahoroba.org:/usr/obj/usr/src/sys/ASUKA  amd64
>>
>> peter> Some experimentation suggested that just "find /" was enough to wedge
>> peter> my system.  I did some experimenting and found that the following
>> peter> loader config was enough to prevent it hanging:
>> peter> vfs.zfs.arc_max="128M"
>> peter> vfs.zfs.arc_meta_limit="50M"
>> peter> vfs.zfs.arc_min="25M"
>> peter> (previously, I had no ZFS tuning at all).
>>
>> I had ZFS tuning before.  However, after this problem was occur, I
>> removed all of ZFS tuning.
>> The FS related setting is only kern.maxvnodes=400000, now.
>>
>> Sincerely,
>>
>> --
>> Hajimu UMEMOTO
>> ume at mahoroba.org  ume at FreeBSD.org
>> http://www.mahoroba.org/~ume/
> I encounter a hangup 3 times after I upgrade to
> 10.3-PRERELEASE r295247M in a zfs configuration (i386 with 2GB memory)
> while trying to run  security/tripwire (compute checksum on all the files).
>
> With /usr/src/sys/kern/vfs_subr.c at revision 291757 all return to normal.
>
> Henri
>
> PS thanks Hajimu

Thanks for the tip. Reverting vfs_subr.c to 291757 keeps things stable 
again.

/Henrik