[OpenAFS] Speed of AFS, continue...

[ted creedon]

On a test server:
1. Play with the hdparm utility - there are some cryptic settings and
performance tests. Use 32 bit transfers (sometimes the OS resets to =
PIO/16
bits on bootup).
2. Invest in a PCI disk controller (tweak and benchmark the hardware =
first)
3. CPU load of 5-6 will give you unacceptable response times - for all
processes
4. Remove all unnessary software from the servers
5. Is the response time problem due to user complaints or just =
observations
based on a test file move?

tedc

-----Original Message-----
From: openafs-info-admin@openafs.org =
[mailto:openafs-info-admin@openafs.org]
On Behalf Of Lars Schimmer
Sent: Saturday, March 12, 2005 3:57 AM
To: openafs-info@openafs.org
Subject: [OpenAFS] Speed of AFS, continue...

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Hi!

I'm kinda frustrated.
Network:
AFS database server on 1.2.13 on PII, no more than database server on it
Fileserver 1 on debian sarge kernel 2.6.9 OpenAFS 1.3.74 Fileserver 2 on
debian sarge kernel 2.6.8 OpenAFS 1.3.79

The network between these three is 100MBit fullduplex full switched, =
yes, I
controlled this.
The PII has the HD on PIO mode, but for a database server, that is OK, =
or?
The other both fileservers has IDE 5400UPM HDs with UDMA5 mode.
Fileserver 1 has one system HD and 2 HDs for /vicepa and /vicepb =
Fileserver
2 has only one HD with system, data and /vicepa

AFS Cache on FS1 is disk, on FS is memcache.

No I have got two volumes, source on FS1, target on FS2, both mounted in =
one
dir.
I looged in on FS2 and try to copy two 2 GB files from the dir (mounted =
on
volume on FS1) into the dir mounted on the volume on FS2.
Speed is ONLY 2 MB/sec maximum and the FS2 is really under load, load of
5-6, nearly latency of 1 sec while typing on another shell on it, but =
CPU
isn't much crowded, I have a dnetc (distributed.net) on nice level on =
it,
top tells me, most time, the dnetc got >50% of CPU.
Oh, both fileservers are Athlon 2 GHz on VIA 333 chip-based boards.
Is AFS really so slow? Or which switch have I forgot to set?
If I try to copy from FS1 to my workstation (both same machines), I got =
4-5
MB/sec over the net... A bit faster, but NOT as near as line speed.
What can I try to speed it up?

Cya
Lars
- --
- -----------------------------------------------------------------
Technische Universit=E4t Braunschweig, Institut f=FCr Computergraphik
Tel.: +49 531 391-2109            E-Mail: schimmer@cg.cs.tu-bs.de
PGP-Key-ID: 0xB87A0E03


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