Date: Mon, 4 Sep 2006 12:19:38 +0400 From: Gleb Smirnoff <glebius@FreeBSD.org> To: "Derrick T. Woolworth" <dwoolworth@gmail.com> Cc: freebsd-current@FreeBSD.org Subject: Re: Jumbo Frames with em Message-ID: <20060904081938.GX40020@FreeBSD.org> In-Reply-To: <10fd06c60609031846x60c40383iaee659aa7ee74300@mail.gmail.com> References: <10fd06c60609031846x60c40383iaee659aa7ee74300@mail.gmail.com>
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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. -- Totus tuus, Glebius. GLEBIUS-RIPN GLEB-RIPE
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