RELENG_5 nfs performance

Mike Tancsa mike at
Mon Sep 20 14:11:53 PDT 2004

At 04:51 PM 20/09/2004, Julian Elischer wrote:
>Make sure that the NIC is configured manually with th eright speed.
>ifconfig vr0 media 100BaseT mediaopt full-duplex
>automatic selection often produces problems like this..

It sort of depends what the switch is configured to. If the switch only 
supports auto-neg, manually setting the nic will cause problems as well.  I 
would say make sure all network elements agree on the duplex setting.

Besides, if its a duplex mismatch, it should show up on the machine's
netstat -ni


>Sascha Holzleiter wrote:
>>I just installed a new system with 5.2.1 which shall serve as a NFS
>>server. While testing the performance of the system was VERY slow.
>>I could read from the server with about 500KB/s and write to it with
>>3,5MB/s on a 100MBit link.
>>copying from the server:
>>       vr0  in      9.138 KB/s         26.394 KB/s          304.019 MB
>>            out   505.639 KB/s        505.639 KB/s            1.236 GB
>>copying to the server:
>>       vr0  in      3.219 MB/s          3.219 MB/s          377.028 MB
>>            out    79.540 KB/s         79.540 KB/s            1.248 GB
>>I then upgraded to 5.3-BETA4 which gives me the same results.
>>Is there anything I'm missing here? The system is Athlon UP system with
>>a via-rhine network card. I tried to set various sysctls e.g.
>>vm.old_msync=1 and debug.mpsafenet=0 which did not help.
>>One strange thing was that after some reboots I got once a rate of 9MB/s
>>but after the next reboot this was gone :)
>>Using FTP for data transport the rate is around 10Mb/s which is quite
>>normal so this seems to be no NIC issue.
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