Re: NFS TCP settings

["Jérôme Warnier" <jwarnier@beeznest.net>]

Le mercredi 21 d=E9cembre 2005 =E0 08:32 -0800, Kenny Simpson a =E9crit :
> --- Trond Myklebust <trond.myklebust@fys.uio.no> wrote:
> > The NFS/RPC code has no direct control over the TCP window size. That
> > would be an issue for the networking people.
>=20
> I have tracked this a bit further, and am reporting back for completeness=
..
>=20
> The version of OnTap we are using (6.4.1p1) does not seem to support RFC =
1323 (large TCP windows),
> but the Linux client does.  The window scaling is communicated in the ini=
tial connection (SYN), so
> if ethereal does not catch that, it will incorrectly report the window si=
ze as the unscaled number
> - making the Linux client appear to be using a very small window.
> The reason it appeared that the small window size was being honored is a =
result of the direct
> crossover cable making the BDP (bandwidth-delay product) very small.
>=20
> As for the server side, because large TCP windows are not supported, the =
best it can do is 64k -
> which it does.  Running with GbE and jumbo packets fills the window quite=
 fast obviating the need
> for RFC 1323.
I'm experiencing big performance trouble with NFS on a GbE NIC (Intel
eepro1000) and a 2.6.8 kernel, to the point of NFS being unusable, and
having to force NIC to 100Mbs. The clients are 10/100 Mbs.
I've made no particular tuning on the server side for the GbE. Could
someone help me to get the most out of this GbE NIC?

Thanks

> Thanks to those who took the time to swing a clue stick in my direction.
>=20
> -Kenny




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