Messages in this thread | | | Subject | Re: vfs: Add MS_FLUSHONFSYNC mount flag | From | Fernando Luis Vázquez Cao <> | Date | Mon, 16 Feb 2009 16:47:24 +0900 |
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On Sun, 2009-02-15 at 17:54 -0500, Theodore Tso wrote: > On Sun, Feb 15, 2009 at 04:23:26PM +0900, Fernando Luis Vázquez Cao wrote: > > You mentioned "we should integrate this with the barrier settings". Do > > you imply we should make it a per-device tunable too? Should we keep the > > barrier-related mount options some filesystems provide? > > > > Making barriers to be a per-device tunable makes sense. The only > reason why we kept it as a mount option in ext4 is for benchmarking > purposes, and in ext3, because the filesystem predated the barrier > code, and there was a desire to be able to benchmark with and without > the old behavior --- and because akpm is still worried about the > performance hit of the barrier code, so he's been resistant about > change the default for ext3.
Ok, I'll turn both barriers and flushonfsync into a sysfs-exported per-device knob and see how it turns out.
By the way, should we also add/keep a mount option for "benchmarking purposes"?. I guess that once we get the per-device tunable we probable do not need it anymore.
Regards,
Fernando
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