Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

[Eric Sandeen]

Andrew Morton wrote:
> On Fri, 16 May 2008 14:02:46 -0500
> Eric Sandeen <sandeen@xxxxxxxxxx> 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.
> 
> I just don't think we can quietly go and slow everyone's machines down
> by this much.  The overhead of journalling is already pretty horrid.
> 
> If we were seeing a significant number of "hey, my disk got wrecked"
> reports which attributable to this then yes, perhaps we should change
> the default.  But I've never seen _any_, although I've seen claims that
> others have seen reports.

Here's a recent one, just FYI.

http://marc.info/?l=ext3-users&m=121205834608161&w=2

-Eric

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/