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Re: NFS performance - more info

To: linux-xfs@xxxxxxxxxxx
Subject: Re: NFS performance - more info
From: Thomas Graichen <news-innominate.list.sgi.xfs@xxxxxxxxxxxxx>
Date: 4 Mar 2001 09:19:06 GMT
Distribution: local
Organization: innominate AG, Berlin, Germany
References: <200103040726.HAA23413@xxxxxxxxxxxxxxxxxxxxxxxxxxx> <97t0uh$5qj$1@xxxxxxxxxxxxxxxxxxxxxx>
Reply-to: Thomas Graichen <thomas.graichen@xxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
User-agent: tin/1.4.4-20000803 ("Vet for the Insane") (UNIX) (Linux/2.4.2-XFS (i686))
Thomas Graichen <thomas.graichen@xxxxxxxxxxxxxx> wrote:
> Robin Humble <rjh@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

>> However, (and I guess you knew this was coming :-) I tried writing to
>> an XFS partition over NFS again - this time using work machines
>> instead of home, and the performance was a still a bit of a worry
>> to say the least.
>> ...
>> machine/config this time:
>> dual celeron 500, ASUS bp6, 512M ram, 4x maxtor 60G/7200rpm drives,
>> 2x promise ultra100 controller cards (each drive on its own controller),
>> RH7.1beta, 2.4.2-XFSsmp-3mar2001 kernel. The network is 100Mbit
>> ethernet (3c905 I think). Reiserfs was not timed as it was unable to
>> make >2G files(!!)

>> time dd if=/dev/zero of=bigFile bs=1024k count=2500

>>             writes to local disk   writes over nfs   notes
>> xfs                16 MB/s            0.7 MB/s    load ~90-100% per cpu + (*)
>> xfs over RAID0     37 MB/s             1  MB/s       ""
>> xfs over RAID5            didn't try yet
>> ext2               17 MB/s             8  MB/s    load ~30-40% per cpu
>> ext2 over RAID0    38 MB/s             8  MB/s       ""
>> ext2 over RAID5    14 MB/s             6  MB/s       "" + (**)

> i just did a very simple test on the setup i can us right now from
> remote and end up at about 2mb/sec (server: up 333mhz pII, 128mb,
> 6gb udma2 disk - so - no big hardware, ah - i forgot: k6-2/400, 64mb
> solaris8 ix86 client) - looks like something is definitely not ok
> with your setup (otherwise i would not get better results with my
> much slower hardware) - so - some things to try:

another datapoint (same setup as above):

              -------Sequential Output-------- ---Sequential Input-- --Random--
              -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
          128  4864 33.6  4501 13.0  3484 17.2  4701 28.8  5554 14.4 109.4  7.2

this is bonnie over nfs - looks quite ok to me for that hardware - also
the nfsd on the server only eats up about 5% cpu while doing this - so
it really looks like something on your setup is not ok


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