Re: tcp/udp performance

Hi,

1) Have you made sure there are no NFS rexmits reported by nfsstat -c ?

2) I haven't run thruput tests lately, but when I tested NFS/UDP thruput a
few months ago, I routinely got over 70MB/s sequential read thruput
and over 80MB/s sequential write thruput (against filers). I used 32KB
blocksizes. -current improves upon this significantly, by about 25%-30%.
Send me private e-mail and we can discuss NFS client tunings.

mohan

--- Danny Braniss <danny@xxxxxxxxxxxxx> wrote:


ever since 6.1 I've seen fluctuations in the performance of
the em (Intel(R) PRO/1000 Gigabit Ethernet).

motherboard OBN (On Board NIC)
---------------- ------------------
1- Intel SE7501WV2S Intel 82546EB::2.1
2- Intel SE7320VP2D2 INTEL 82541
3- Sun Fire X4100 Server Intel(R) PRO/1000

test 1: writing to a NetApp filer via NFS/UDP
FreeBSD Linux
MegaBytes/sec
1- Average: 18.48 32.61
2- Average: 15.69 35.72
3- Average: 16.61 29.69
(interstingly, doing NFS/TCP instead of NFS/UDP shows an increase in speed of
around 60% on FreeBSD but none on Linux)

test2: iperf using 1 as server:
FreeBSD(*) Linux
Mbits/sec
1- 926 905 (this machine was busy)
2- 545 798
3- 910 912
*: did a 'sysctl net.inet.tcp.sendspace=65536'


So, it seems to me something is not that good in the UDP department, but
I can't find what to tweek.

Any help?

danny


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