Date: Tue, 21 Mar 2006 18:58:01 -0500 From: Mikhail Teterin <mi+mx@aldan.algebra.com> To: "Patrick M. Hausen" <hausen@punkt.de> Cc: alc@freebsd.org, stable@freebsd.org Subject: Re: more weird bugs with mmap-ing via NFS Message-ID: <200603211858.02801.mi%2Bmx@aldan.algebra.com> In-Reply-To: <20060321234856.GA24194@hugo10.ka.punkt.de> References: <200603211607.30372.mi%2Bmx@aldan.algebra.com> <200603211831.54172.mi%2Bmx@aldan.algebra.com> <20060321234856.GA24194@hugo10.ka.punkt.de>
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в╕второк 21 березень 2006 18:48, Patrick M. Hausen Ви написали: > On Tue, Mar 21, 2006 at 06:26:45PM -0500, Mikhail Teterin wrote: > > The problem is about same with 32K and 16K packets. With 8K packets, the > > thing kind-of works (although trying to `systat -vm' still stalls disk > > access), but the outgoing traffic is over 20Mb/s on average -- MUCH more, > > than the writing program itself generates. > > Are you using TCP or UDP for your NFS mounts? I don't specify either, but the default is UDP, is not it? > Now imagine a client that experiences this problem only > sometimes. Modern hardware, but for some reason (network > congestion?) some frames are still lost if sent back-to-back. > (Realtek chipset on the receiving side?) No, both sides have em-cards and are only separated by a rather decent large switch. I'll try the TCP mount, workaround. If it helps, we can assume, our UDP NFS is broken for sustained high bandwidth writes :-( Thanks! -mi
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