Date: Mon, 4 Sep 2006 23:26:30 -0700 From: "Jack Vogel" <jfvogel@gmail.com> To: "Gleb Smirnoff" <glebius@freebsd.org> Cc: freebsd-current@freebsd.org, "Derrick T. Woolworth" <dwoolworth@gmail.com> Subject: Re: Jumbo Frames with em Message-ID: <2a41acea0609042326y3f020901ja5d020e6734a4b84@mail.gmail.com> In-Reply-To: <20060904081938.GX40020@FreeBSD.org> References: <10fd06c60609031846x60c40383iaee659aa7ee74300@mail.gmail.com> <20060904081938.GX40020@FreeBSD.org>
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On 9/4/06, Gleb Smirnoff <glebius@freebsd.org> wrote: > On Sun, Sep 03, 2006 at 08:46:21PM -0500, Derrick T. Woolworth wrote: > D> I'm running -current on a NFS file server with a 3ware controller > D> striping across multiple disks. The box uses the em driver with the > D> mtu set to 8192 - client machines connecting via NFS that are also > D> running -current with bge drivers with the mtu set to 8192 (and jumbo > D> frames enabled on the switch)... > D> > D> The em driver's README says that UDP and Jumbo Frames don't play well > D> together - just wondering if this would have any impact on NFS over > D> TCP? > > This comment is quite old. It may happen that this isn't true anymore. > May be developers from Intel will comment on this. > > D> Does anyone know anything about the future of the em driver or > D> bge driver that might have performance issues with Jumbo Frames? > D> > D> I'm only ever seeing the storage system write about 10 to 15MB (bytes) > D> per second over NFS. > > Have you tested the performance with ftp, netcat or some network > benchmarking tool? The problem may be in NFS not in driver. Its not entirely clear in your post Derrick, are you using TCP or UDP NFS? Jack
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