Re: ZFS/RAIDZ and SAMBA: abyssimal performance
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Fleuriot Damien <ml@my.gd> wrote:
>=20
> On Jan 4, 2013, at 4:19 PM, O. Hartmann <ohartman@zedat.fu-berlin.de> wro=
te:
>=20
> > Am 01/04/13 15:45, schrieb Garrett Cooper:
> >> On Fri, Jan 4, 2013 at 6:06 AM, Fleuriot Damien <ml@my.gd> wrote:
> >>=20
> >> ...
> >>=20
> >>> And this is under [global] in /usr/local/etc/smb.conf:
> >>> min receivefile size =3D 16384
> >>> aio read size =3D 16384
> >>> aio write size =3D 16384
> >>> aio write behind =3D yes
> >>=20
> >> These are still pretty low, depending on what your networking/disk
> >> setup is like; my important performance settings are:
> >>=20
> >> socket options =3D SO_RCVBUF=3D64240 SO_SNDBUF=3D64240 TCP_NODE=
LAY
> >> IPTOS_LOWDELAY IPTOS_THROUGHPUT
> >> write cache size =3D 65536
> >> aio read size =3D 65536
> >> aio write size =3D 65536
> >> directory name cache size =3D 0
> > Well, now I have peak values ~ 120 MB/s when copying. I applied Fleuriot
> > Damien's values to /boot/loader.conf and yours to the smb.conf.
> > Somewhere in the handbook this should be documented! it is to much
> > efford to get SAMBA working properly with ZFS, if the tricks and
> > problems are so widespread over several architectural aspects of the sy=
stem.
> >=20
> > It could save a lot of time for adminsitartors and those which try
> > FreeBSD as a serving system instead of Linux.
> >=20
> > Just for the record. I feel a bit confused about all the tricks and
> > tweak now "published" for ZFS, its magic L2ARC, the kernel_vmem wizzardy
> > thingis. The ZFS Wiki seems to be a bit outdated and confusing, it would
> > be a great deal if all these things could be lined up a s a primer with
> > a bit more explanations than "put this number there".
> The problem, Oliver, is that these values are system dependant.
While I agree that the values are system dependant the purpose of
the tunables could still be documented together with a description
of how to properly test that they have any effect at all and that
it's an improvement compared to the defaults.
Scarce ZFS tuning documentation is also a problem upstream which
probably doesn't help.
Fabian
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