The user space daemon in afs doesn't do much of anything. It's there primarily to launch kernel threads and set up the cache.
-- Nathan ------------------------------------------------------------ Nathan Neulinger EMail: [EMAIL PROTECTED] University of Missouri - Rolla Phone: (573) 341-4841 Computing Services Fax: (573) 341-4216 > -----Original Message----- > From: Nathan Ward [mailto:[EMAIL PROTECTED] > Sent: Thursday, February 27, 2003 1:52 PM > To: [EMAIL PROTECTED] > Cc: Michael Robokoff; openafs > Subject: Re: [OpenAFS] Performance > > > Well I'd expect that it goes slower as your cache size is > exceeded as it > then needs to start getting that data to the server. Or is > the cache for > read operations only? > > 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. > > > -------------------------------------------------------------- > ---------- > > -- > > 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. > >> > > > > _______________________________________________ > > OpenAFS-info mailing list > > [EMAIL PROTECTED] > > https://lists.openafs.org/mailman/listinfo/openafs-info > > > > > > > _______________________________________________ > OpenAFS-info mailing list > [EMAIL PROTECTED] > https://lists.openafs.org/mailman/listinfo/openafs-info > _______________________________________________ OpenAFS-info mailing list [EMAIL PROTECTED] https://lists.openafs.org/mailman/listinfo/openafs-info
