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JLS2009: A Btrfs updateJLS2009: A Btrfs updatePosted Nov 4, 2009 0:01 UTC (Wed) by nix (subscriber, #2304)In reply to: JLS2009: A Btrfs update by anton Parent article: JLS2009: A Btrfs update
Unfortunately, both of those are only good filesystems if you really don't
care at all about either read or write speed. The latency figures Linus posted (from one process dd(1)ing and another writing tiny files and fsync()ing them) are appalling. We're not talking a mere few seconds, we're talking over a minute at times.
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JLS2009: A Btrfs update Posted Nov 5, 2009 14:04 UTC (Thu) by anton (guest, #25547) [Link] ext3 with data=ordered is fast enough in my experience (which includes several multi-user servers).What you write about these figures [citation needed] reminds me of my experiences with copying stuff to flash devices. However, no writing to an ext3 file system was involved there, and I suspect that the problem is sitting at a lower level than the msdos or vfat file system.
JLS2009: A Btrfs update Posted Nov 5, 2009 18:08 UTC (Thu) by nix (subscriber, #2304) [Link]
Yeah, that's (as you know from the comment you linked to) a problem that
the per-bdi writeback fix should solve. I saw it back in the days before cheap USB hard drives, when I ran backups onto pcdrw...
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