On +2021-12-20 17:59:33 +0100, Mathieu Othacehe wrote: > > Hey, > > > This is still pretty bad, but better than the <1M performance suggested > > by previous runs. > > Mmh interesting, I also have a x10 speed up on sdb by increasing the > block size from 4k to 512k. I'm not sure what conclusion should we draw > from this observation. > > In particular for our most urging matter, /gnu/store/trash > removal. Moving to a faster hard drive would definitely help here, but I > still don't understand if that disk performance regression comes from > Linux, the file-system fragmentation, or the disk itself. > > > READ: bw=1547MiB/s (1622MB/s), 1547MiB/s-1547MiB/s (1622MB/s-1622MB/s), > > io=3055MiB (3203MB), run=1975-1975msec > > WRITE: bw=527MiB/s (553MB/s), 527MiB/s-527MiB/s (553MB/s-553MB/s), > > io=1042MiB (1092MB), run=1975-1975msec > > Wooh that's fast! On test could be to copy the /gnu/store/trash content > to the SAN an observe how long that it takes for this operating to > complete.
also might be interesting to copy to /dev/null to see read rate alone on /gnu/store? > > Thanks for your support on that complex topic :) > > Mathieu > > > -- Regards, Bengt Richter
