ZFS (ARC) performance regression in r321610

Harry Schmalzbauer freebsd at omnilan.de
Wed Aug 29 10:14:27 UTC 2018


Am 29.08.2018 um 11:45 schrieb rainer at ultra-secure.de:
> Am 2018-08-27 16:19, schrieb Lev Serebryakov:
>> On 27.08.2018 16:47, Yamagi Burmeister wrote:
>>
>>> With this program I was able to bisect the source and identify commit
>>> r321610 (MFV r318946: 8021 ARC buf data scatter-ization) as the 
>>> culprit:
>>> https://svnweb.freebsd.org/base?view=revision&revision=321610
>>  You could try to set "zfs_abd_scatter_enabled = 0" via kgdb and repeat
>> tests to be sure, that this code is a problem.
>>
>>  BTW, it is not clear, that FreeBSD needs this at all.
>
>
> Hi,
>
> how exactly do I do this?
>

Maybe this is more/easier applicaple for you:
https://svnweb.freebsd.org/changeset/base/338365

Can't really answer your question, but should help getting the desired 
result :-)

-harry


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