tcp/udp performance

[Mohan Srinivasan]

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 at 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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