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  • From: Eric Sandall <eric AT sandall.us>
  • To: Thomas Orgis <thomas-forum AT orgis.org>
  • Cc: sm-users AT lists.ibiblio.org
  • Subject: Re: [SM-Users] Install without ISO
  • Date: Tue, 13 Dec 2005 11:50:25 -0800 (PST)

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On Mon, 12 Dec 2005, Thomas Orgis wrote:
Try `ls -la /tmp/sorcery/cast/25032/` to list possibly hidden files.

They are gone at that time... but I remember having seen .nfsblablabla file
names appearing.

Otherwise this is most likely caused by NFS 'lag', of which reports
have been sent to LKML about for many of the 2.6.x kernel series,

Yes... Somehow nfs is extremely slow. On the Sourcemage machine with root on
NFS:

root@kiste:~# time dd if=/dev/zero of=/test bs=1M count=200 ; time sync
200+0 Datens?tze ein
200+0 Datens?tze aus

real 6m8.623s
user 0m0.020s
sys 0m2.235s

real 0m0.048s
user 0m0.001s
sys 0m0.003s

That's about 0.54M/s... with real world work with many smaller files I get
sth. around 100 to 200K/s in ethstatus.

On the same machine and to the same drive on the server, but mounted via smb
it's 1.4M/s. That's better and now the veritable K5 on the server looks
moderately busy (60% CPU for smb).

For comparison: Writing from my (slower that the sourcemage machine) laptop
using LFS with kernel 2.6.11 gives 2.4M/s

Reading back the file over NFS on the SM box yields 2.7M/s; while the laptop
gets 6.2M/s (that really is the limit of the server).


So, you say trying another - older! - kernel (like 2.6.11) on the SM box
could help performance? What is with the server? It's running 2.6.13.3 ...

Could be kernel options for NFS that you're missing or added and don't
operate well with the server.

I get:
$ time dd if=/dev/zero of=./test bs=1M count=200 ; time sync
200+0 records in
200+0 records out
209715200 bytes (210 MB) copied, 22.7536 seconds, 9.2 MB/s

real 0m22.756s
user 0m0.001s
sys 0m0.504s

real 0m0.002s
user 0m0.001s
sys 0m0.000s

Over my NFS (with a 16-port 10/100Mb switch between this machine and
the NFS server).

The client (jet) is using 2.6.14.2 kernel (config:
http://smgl.sandall.us/config/linux-2.6.14.2.cfg-jet.bz2).
Test grimoire, if it matters.

The server (cerberus) is using 2.6.10-as7 kernel (config:
http://smgl.sandall.us/config/linux-2.6.10-as7-cerberus.bz2).
Stable grimoire, if it matters.

- -sandalle

- --
Eric Sandall | Source Mage GNU/Linux Developer
eric AT sandall.us | http://www.sourcemage.org/
http://eric.sandall.us/ | SysAdmin @ Inst. Shock Physics @ WSU
http://counter.li.org/ #196285 | http://www.shock.wsu.edu/
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