Date: Wed, 30 Aug 2006 11:42:02 -0700 (PDT) From: Mohan Srinivasan <mohan_srinivasan@yahoo.com> To: Danny Braniss <danny@cs.huji.ac.il>, freebsd-stable@FreeBSD.org, freebsd-net@FreeBSD.org Subject: Re: tcp/udp performance Message-ID: <20060830184202.4488.qmail@web30807.mail.mud.yahoo.com> In-Reply-To: <E1GIMNJ-0000Dd-QH@cs1.cs.huji.ac.il>
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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@cs.huji.ac.il> 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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