I notice that there are around about the same number of packets/sec as context switches/sec on my client machines. I wonder if switches between userland and kernel could be to blame... ? Who sends packets in OpenAFS, the userspace daemon or the kernel?
Nathan
[EMAIL PROTECTED] wrote:
Could the slowness you see with your dd write test be related to the cache exhaustion issue that I raised recently, when writing a file larger than your cache size. Your test writes a 1 GB file, so if your cache is smaller than this, you will see poor performance once your cache size is exceeded.
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Edward Moy
Apple Computer, Inc.
[EMAIL PROTECTED]
(This message is from me as a reader of this list, and not a statement from Apple.)
On Thursday, February 27, 2003, at 11:15 AM, Nathan Ward wrote:
I see pretty bad performance to tell you the truth.
I can read and write ~60mb/s directly to my raid array, but when using OpenAFS (locally or remotely) to the same array, I get around 6-10MB/s, I have seen up to 25MB/s over a peice of 1000Mbps fibre. Client and Server are both dual P3-1ghz with 1024mb ram. I notice the context switches on the server at this time jump to ~10000/s, and on the client ~40000/s. I imagine this is the source of my slowdown, but I havn't had a chance to look into it.
I'd be interested if anyone else has the same level of context switches going on.
This is while doing a large sequential write operation (dd if=/dev/zero of=/afs/alb-nz.esphion.com/public/dd.out bs=256k count=4096).
Michael Robokoff wrote:
Does anyone have any Open AFS performance information they can share with me. I plan on doing a couple benchmarks and I would like to have some idea of what to expect.
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