Date: Mon, 09 Jun 2003 18:50:53 -0400 From: Matt Levine <matt@deliver3.com> To: Eric Anderson <anderson@centtech.com> Cc: freebsd-performance@freebsd.org Subject: Re: Slow disk write speeds over network Message-ID: <BB0A878D.C143%matt@deliver3.com> In-Reply-To: <3EE50743.1090704@centtech.com>
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On 6/9/03 6:16 PM, "Eric Anderson" <anderson@centtech.com> wrote: > Chuck Swiger wrote: >> Eric Anderson wrote: >> >>> Ok, I have a file server (NFS) running FreeBSD 4.8-RC1, which is >>> having incredibly slow disk write speeds. Locally, doing something like: >>> dd if=/dev/zero of=/partition/testfile >>> Shows 14MB/s - which is what I expect.. >>> >>> However, ftping a file or cp'ing over NFS shows speeds less than 1MB/s >>> - which is not what I would expect - it's got gigabit ethernet, and >>> has very fast read times (via ftp or nfs) over the network. >> >> >> If the slowdown was only with regard to NFS, I'd ask you about what your >> NFS clients looked like. However, if you're seeing a slowdown for FTP >> and other network protocols, it's more likely to be a physical problem >> with cabling, a NIC getting flaky, or something along those lines. > > I see it in both NFS and ftp transfers, but like I said in one of my > other notes, I have 4 network cards in this machine, all act the same way. > >> Do you have this connected to a managed switch so that you can take a >> look at the interface statistics for problems? Maybe try cranking the >> NIC down from gigabit to 100Mbs ethernet speed and see whether that >> makes a difference? > > Yes - and I just tried that suggestion - same thing. No help. > Interfaces look ok. Not to beat a dead horse, but are these the same nics as in the other machines? Is the switch manageable? Does it agree with the nic(s) on speed/duplex? Tried turning off autonegotiate and forcing on both sides? This has all the symptoms of a duplex mismatch. > > Eric -- Matt Levine <matt@deliver3.com> "The Trouble with doing anything right the first time is that nobody appreciates how difficult it was." -BIX
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