Date: Tue, 23 Dec 1997 12:06:05 -0800 (PST) From: Tom <tom@uniserve.com> To: Evan Champion <evanc@synapse.net> Cc: freebsd-questions@freebsd.org Subject: Re: Improving NFS Performance Message-ID: <Pine.BSF.3.96.971223120247.16399C-100000@shell.uniserve.com> In-Reply-To: <Pine.BSF.3.96.971223142146.23799B-100000@piano.synapse.net>
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On Tue, 23 Dec 1997, Evan Champion wrote: > On Tue, 23 Dec 1997, Evan Champion wrote: > > > On local disks, I am able to get transfer rates in the megabytes per > > second; from the NFS server, I am seeing a ceiling of about 40 _kilobytes_ > > per second! It is so poor that I am actually able to see the difference > > connected over ISDN, where an FTP from the server would net 15 kBps, but I > > only get 9 FTP'ing from the mounted disk on one of the clients. > > I decided to see what would happen if I used nfsv2 instead of nfsv3. My > transfer rates went from 40 kilobytes per second to 3-4 megabytes per > second! For NFSv2, were you using udp or tcp mounts? > Can someone explain to me why that might be? :-) - Poor options for nfsv2 - Bad interaction with network card. NFS udp can overrun some cards too easily, meaning the card is always dropping packets. I belive tcp mounts will back off better. > Thanks. > > Evan Tom
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