Re: 2.4.20rc1 NFS V3 UDP client problems

[Eric Whiting <ewhiting@amis.com>]

I disabled jumbo frames and I'm seeing 70M/s reads (with a clean
cache)..

There must be a UDP or NFS client problem with the 9000 mtu packets.

eric



Eric Whiting wrote:
> 
> I'm seeing some 2.4.20rc1 client problems.
> 
> 25 seconds to write a 1G file
> 13 minutes to read that file back
> 
> CLIENT 2.4.20rc1 NFSV3 UDP HIGHMEM SUPPORT ON
> gigE card with jumbo frames enabled
> Tested with both netgear and intel -- same result
> 
> SERVER
> Netapps 825 ontap 6.3
> gigE card with jumbo frames enabled
> 
> private point-to-point connection.
> 
> Is this a HIGHMEM problem? Or is it related to jumbo frames? I'll test
> with both disabled.
> 
> I'm seeing network errors on the client -- dropped and overruns are both
> the same.
> 
> Anything I should try?
> 
> eric
> 
> # time dd if=/dev/zero of=file1 bs=1G count=1
> 1+0 records in
> 1+0 records out
> 
> real    0m25.881s
> user    0m0.000s
> sys     0m4.220s
> 
> (run a program to calloc 1G of RAM and clear some buffer cache)
> 
> # time dd if=file1  of=/dev/null
> 
> 2097152+0 records in
> 2097152+0 records out
> 
> real    13m7.445s
> user    0m0.370s
> sys     0m2.160s
> 
>  # ifconfig eth0
> eth0      Link encap:Ethernet  HWaddr 00:02:B3:AC:52:F5
>           inet addr:10.0.0.2  Bcast:10.255.255.255  Mask:255.0.0.0
>           UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
>           RX packets:1534585 errors:10240 dropped:10240 overruns:10240
> frame:0
>           TX packets:5332748 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100
>           RX bytes:2069590604 (1973.7 Mb)  TX bytes:587855320 (560.6 Mb)
>           Interrupt:12 Base address:0xc000 Memory:ea020000-ea040000
> 
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