On 1/8/07, Andrew Morton <[EMAIL PROTECTED]> wrote:
On Mon, 8 Jan 2007 10:08:34 +0100
Lars Ellenberg <[EMAIL PROTECTED]> wrote:
> md raidX make_request functions strip off the BIO_RW_SYNC flag,
> thus introducing additional latency.
>
> fixing this in raid1 and raid10 seems to be straight forward enough.
>
> for our particular usage case in DRBD, passing this flag improved
> some initialization time from ~5 minutes to ~5 seconds.
That sounds like a significant fix.
So will this fix also improve performance associated with raid1's
internal bitmap support? What is the scope of the performance
problems this fix will address? That is, what are some other examples
of where users might see a benefit from this patch?
regards,
Mike
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