ZFS (ARC) performance regression in r321610

[rainer at ultra-secure.de]

Am 2018-08-29 13:19, schrieb Yamagi Burmeister:
> Hi,
> my patch was committed this morning. If you're on 12-CURRENT you can
> just set vfs.zfs.abd_scatter_enabled to 0. On other branches the
> easiest way to make the change permanent is to edit
> sys/cddl/contrib/opensolaris/uts/common/fszfs/abd.c and change
> zfs_abd_scatter_enabled (on 11.2 it's in line 141) from B_TRUE to
> B_FALSE. Then rebuild the kernel, reboot and you're done.



Hi,

thanks a lot.

It's just that none of my machines have sources.
The last time I actually compiled a kernel was for

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594

IIRC.
It's not that I don't know how to do it (I started with FreeBSD 2.2.x).
The problem is also that I have to ask for downtime for each reboot or 
just restart of mysql on those servers and it can only be done after 
10pm.
And it takes the f'ing HP server 10m to be back at the login-prompt.

But I'll look into it. The servers are on 11.2.



Best Regards,
Rainer