Date: Tue, 5 Sep 2006 10:05:29 -0500 From: "Derrick T. Woolworth" <dwoolworth@gmail.com> To: "Jack Vogel" <jfvogel@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: Jumbo Frames with em Message-ID: <10fd06c60609050805j52f4ea83kb53799255de7ab33@mail.gmail.com> In-Reply-To: <2a41acea0609042326y3f020901ja5d020e6734a4b84@mail.gmail.com> References: <10fd06c60609031846x60c40383iaee659aa7ee74300@mail.gmail.com> <20060904081938.GX40020@FreeBSD.org> <2a41acea0609042326y3f020901ja5d020e6734a4b84@mail.gmail.com>
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I'm using TCP currently, getting around 10MB/sec when writing one to three files over NFS. With UDP I get around 2 to 4/MB/sec. I did do a network test with netpipe and with the mtu set to 9000 on all cards, netpipe shows I'm getting 125MB/sec at 8192 byte packets. I assume this would be typical of a GB network and indicates that speed wise, the network is functioning well. I do notice a fairly large speed decrease when writing to either my RAID0 or RAID5 store (really shocked to find the RAID0 running slower than a NFS mount to an IDE drive, but nevertheless). The speed of NFS is orders of magnitude slower than the network or the disks. Thanks, D On 9/5/06, Jack Vogel <jfvogel@gmail.com> wrote: > 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 > -- Derrick T. Woolworth, President ServeTheWeb, LLC. http://www.ServeTheWeb.com
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