ZFS (ARC) performance regression in r321610

[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?



Best Regards
Rainer