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Flushing out pdflush

Posted Apr 17, 2009 12:39 UTC (Fri) by axboe (subscriber, #904)
In reply to: Flushing out pdflush by jzbiciak
Parent article: Flushing out pdflush

Actually, no. With btrfs, currently it assigns a per-fs backing device to each inode. So for that particular case, you have just a single bdi flusher thread running even for the 10 disks.

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Posted Feb 10, 2011 8:25 UTC (Thu) by bergwolf (subscriber, #55931) [Link]

Then why does per-bdi flusher improves that much performance for btrfs? If the key idea is *per-bdi*, there is little difference for btrfs. But where does the performance come from?