Messages in this thread | | | From | Chris Mason <> | Subject | Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes | Date | Mon, 19 May 2008 09:26:41 -0400 |
| |
On Sunday 18 May 2008, Andi Kleen wrote: > Andrew Morton <akpm@linux-foundation.org> writes: > > On Fri, 16 May 2008 14:02:46 -0500 > > > > Eric Sandeen <sandeen@redhat.com> wrote: > >> A collection of patches to make ext3 & 4 use barriers by > >> default, and to call blkdev_issue_flush on fsync if they > >> are enabled. > > > > Last time this came up lots of workloads slowed down by 30% so I > > dropped the patches in horror. > > Didn't ext4 have some new checksum trick to avoid them?
I didn't think checksumming avoided barriers completely. Just the barrier before the commit block, not the barrier after.
-chris
| |