2011-07-18 20:37:25 +0100, Stephane Chazelas: > 2011-07-18 11:39:12 +0100, Stephane Chazelas: > > 2011-07-17 10:17:37 +0100, Stephane Chazelas: > > > 2011-07-16 13:12:10 +0100, Stephane Chazelas: > > > > Still on my btrfs-based backup system. I still see one BUG() > > > > reached in btrfs-fixup per boot time, no memory exhaustion > > > > anymore. There is now however something new: write performance > > > > is down to a few bytes per second. > > > [...] > > > > > > The condition that was causing that seems to have cleared by > > > itself this morning before 4am. > > > > > > flush-btrfs-1 and sync are still in D state. > > > > > > Can't really tell what cleared it. Could be when the first of > > > the rsyncs ended as all the other ones (and ntfsclones from nbd > > > devices) ended soon after > > [...] > > > > New nightly backup, and it's happening again. Started about 40 > > minutes after the start of the backup. > [...] > > Actively running at the moment are 1 rsync and 3 ntfsclone. > [...] > > And then again today. > > Interestingly, I "killall -STOP"ed all the ntfsclone and rsync > processes and: [...] > Now 95% of the write(2)s take 4 seconds (while it was about 15% > before I stopped the processes). [...]
And this morning, after killing everything so that nothing was writing to the FS anymore, 95% of write(2)s were delayed as well (according to strace -Te write yes > file-on-btrfs). Then I rebooted (sysrq-b) and am trying btrfsck (from integration-20110705) on it, but btrfsck is using 8G of memory on a system that has only 5G so it's swapping in and out constantly and getting nowhere (and renders the system hardly usable) I found http://thread.gmane.org/gmane.comp.file-systems.btrfs/5716/focus=5728 from last year. Is that still the case? PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1950 root 20 0 7684m 4.4g 232 R 4 91.1 4:22.87 btrfsck (and still growing) vmstat 1 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 2 2 3232016 115232 4524 3520 698 708 3305 716 991 570 3 1 56 39 0 2 3231816 111536 5976 3428 2964 532 4912 532 1569 683 1 0 46 53 0 2 3231144 105832 8144 3536 3140 24 5324 24 1612 392 1 1 38 60 0 2 3231532 104964 8180 3684 2672 900 2708 900 1017 324 1 1 34 64 -- Stephane -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
