On Sat, 22 Apr 2006, Russ Allbery wrote:
Niklas Edmundsson <[EMAIL PROTECTED]> writes:
Package: openafs-fileserver
Version: 1.4.1-2
We had various performance-issues with 1.4.0, and during that debugging
we found out that the problem was made even worse by the fact that the
openafs fileserver is started without any tuning options. Since our
fileserver was initially installed using an older package, this might be
fixed now, and in that case I appologise.
The interesting line in /etc/openafs/BosConfig should be modified to
include:
parm /usr/lib/openafs/fileserver -p 23 -busyat 600 -rxpck 400 -s 1200 -l 1200
-cb 65535 -b 240 -vc 1200
The above tuning is recommended according to Harald Barth, for the
following reasons:
* It's unclear what the defaults are unless you dig into the source.
* Modern hardware have no problem with increasing buffers and threads
a bit.
* Having too few threads will cause your fileserver to stall if too
many threads ends up waiting for something (breaking callbacks and
timing out, whatever).
My ideal would be to get the defaults fixed, of course, but in the
meantime I can see the argument that relying on the current defaults is a
bad idea. I think this only affects the afs-newcell command and the
documentation, though; in general, AFS leaves it to you to set up your
fileserver command however you want it, and only the Debian afs-newcell
automated cell creation script encodes parameters (or lack thereof).
OK.
We use:
-L -p 125 -rxpck 400 -busyat 200 -cb 65535
but I think that may actually be too many threads. I'm curious about the
differences. Ideally, before picking defaults to put into the
documentation, I'd like this to be discussed on openafs-info towards some
sort of consensus (which is where the current client cache parameters came
from). If you have a chance and are willing to start that conversation,
that would be great; if not, I'll try to do so in the not too distant
future.
The thread-count is/was capped at 23 I think, but I'll let Harald
confirm/deny that.
As you might have figured out I'm rather clueless when it comes to
openafs fileserver tuning, so I think it's better if you initiate the
discussion on openafs-info.
/Nikke
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Niklas Edmundsson, Admin @ {acc,hpc2n}.umu.se | [EMAIL PROTECTED]
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