Re: NFS performance with 10GBase-T

H

On Sun, Feb 25, 2024 at 6:51 PM Rick Macklem <rick.macklem@gmail.com> wrote:

> On Sun, Feb 25, 2024 at 1:21 AM <tuexen@freebsd.org> wrote:
> >
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> >
> > > On Feb 25, 2024, at 01:18, Hannes Hauswedell <h2+lists2024@fsfe.org>
> wrote:
> > >
> > > Hi everyone,
> > >
> > > I am coming here from
> > > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=2771971160
> > I guess this should read:
> > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277197
> Btw, what Hannes reported in the PR was that performance was
> about the same for Linux and FreeBSD NFS clients when the link
> was using a 1500byte ethernet frames.
> However, Linux performs much better with 9K jumbo frames
> whereas FreeBSD performance does not improve for 9K jumbo
> frames. (Some mount options I suggested did help somewhat
> for FreeBSD. Basically increasing rsize/wsize did help, but he
> still sees performance below what Linux gets when 9K jumbo frames
> are used. (I did note the potential problem of mbuf cluster pool
> fragmentation when 9K jumbo frames are used, although I did not
> intent to imply that this issue is involved, just that it is a known
> deficiency that "might" be a factor.)
>
> rick
> >
> > Best regards
> > Michael
> > >
> > > TL;DR:
> > >
> > > * I have a FreeBSD14 Server and Client with an Intel X540 (ix) adaptor
> each.
> > > * I am trying to improve the NFS throughput.
> > > * I get 1160 MiB/s via nc, but only ~200 MiB/s via NFS.
> > > * Increasing rsize and wsize to 1 MiB increases throughput to 395 MiB/s
> > > * But a Linux client achieves 560-600 MiB/s with any rsize.
> > > * The mtu is set to 9000 but this doesn't make a difference for the
> FreeBSD client (it does make a difference for Linux).
> > >
> > > I assume < 400 MiB/s is not the expected performance? Do you have any
> advice on debugging this?
> > >
> > > Thank you for your help,
> > > Hannes
> > >
> >
> >
> >
>
>  Hannes
   In the dmesg posted I see that you have a epair loaded . Are you trying
to do NFS inside of a Jail ?

Rick, Didn't someone from Isilon or Dell/EMC post about the 9K frames a
long time ago ?  I know in isilon land
their FreeBSD can do this, but I can't say I have any idea how it's being
done. They do have some kernel auto-tune magic as well
to find optimal send and receive buffers. Maybe what we are seeing is Linux
having better ergonomics on buffers out of the box ?

Hannes
  Can you post your boot.conf and sysctl.conf settings.
-- 
mark saad | nonesuch@longcount.org