Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Yes thank you !!! That was it. I'm using similar values as Peter now: sndbuf-size 512k; (default) max-buffers 20480; max-epoch-size 16384; unplug-watermark 20480; And it works! sndbuf-size I left to default as I didn't see much effect. Are there any concerns related to these values ?? Still funny why I had high synch rates with my old config and kernel 2.6.16. Best regards, Bernhard -------- Original-Nachricht -------- Datum: Thu, 5 Oct 2006 10:42:10 +0200 Von: Peter Sabaini <peter at sabaini.at> An: drbd-user at lists.linbit.com Betreff: Re: [DRBD-user] sync rate only 2,204 (1,220) K/sec? > On Wednesday 04 October 2006 19:30, Lars Ellenberg wrote: > > / 2006-10-04 18:36:40 +0200 > > > > \ Peter Sabaini: > > > > > # hdparm -t /dev/cciss/c0d0 > > > > > > > > > > /dev/cciss/c0d0: > > > > > Timing buffered disk reads: 208 MB in 3.03 seconds = 68.69 > MB/sec > > > > > > > > > > It could be better, but its reasonable I think? > > > > well, actually, write performance would be more interesting. > > make sure that the raid is not rebuilding at the same time. > > > > also, the cciss controler likes high values for > > max-buffers > > max-epoch-size > > unplug-watermark > > Ok, that helped -- I now get around 23MB/s which is not great but a lot > better > than before :-) > > For the record I now use > > sndbuf-size 1M; > max-buffers 32768; > max-epoch-size 16384; > unplug-watermark 32768; > > I cant test right now but from an earlier naive test (dd if=/dev/zero > of=zero.dat bs=1M count=4096) write performance was around 32MB/s for the > disk device (ext3 on top of lvm), so thats the limiting factor now I > guess. > Any advice on getting more out of that cciss? :-) > > Thanks a lot, > peter. > > > -- > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Peter Sabaini > ARC Seibersdorf research GmbH > Biomedical Engineering / eHealth systems > Reininghausstrasse 13/1, 8020 Graz, Austria > T: +43(0)316 586570-55, F:+43(0)316 586570-12 > peter.sabaini at arcsmed.at, http://www.arcsmed.at/ehs > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer