Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Tuesday 21 September 2004 23:22, Josh McAllister wrote: > First of all... THANK YOU, MAJOR improvement: > 0: cs:SyncSource st:Secondary/Secondary ld:Consistent > ns:7376452 nr:0 dw:0 dr:7377568 al:0 bm:449 lo:0 pe:916 ua:279 ap:0 > [===>................] sync'ed: 16.6% (36391/43591)M > finish: 0:09:26 speed: 65,660 (55,432) K/sec > > Based purely on perception (I haven't actually timed full sync with both > versions -- but I could if it would be useful) though the number reported > (55,432) is still 30% less than it was with 0.6.13 it seems to be > performing on par. Could it be that the calculation for the average rate is > a bit more accurate/different in 0.7.x? > Well probabely the attached patch will win back the last 30%. May I ask you again to verify this, and to post your results to the list. > > With that out of the way, a couple more observations on this issue: > > 1. With max-buffers/max-epoch @ 256/256 as it was, sync rate was about > 48MB/sec. 2048/2048 gave about 52MB/sec. 1024/2048 yielded the result > posted (55MB/sec). This seems more sensible. > max-epoch-size does not have any effect on resync performace. max-buffers should be at least 2048 for such performant hardware I think. It might be a good idea to have max-epoch-size smaller than max-buffers, to achive best mirroring (cs = connected) performance. > 2. I've done some additional performance testing with bonnie... some > potentially interesting results below. Looks like 0.6.13 is still faster > overall, and neither is even half as fast as direct device. Is this not an > accurate measure? > ~80MB/sec on device ~40MB/sec mirrored via DRBD. Ever tested the performance of the interconnect ? Jumbo Frames ? PS: The previous patch already made it into SVN, so this one stack upon the patch posted by Lars. -Philipp -- : Dipl-Ing Philipp Reisner Tel +43-1-8178292-50 : : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : : Schönbrunnerstr 244, 1120 Vienna, Austria http://www.linbit.com : -------------- next part -------------- A non-text attachment was scrubbed... Name: get_last_30_percent.diff Type: text/x-diff Size: 1446 bytes Desc: not available URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20040922/13e54544/attachment.diff>