Re: Bug in kernel 2.6.31, Slow wb_kupdate writeout

[Martin Bligh]

> An interesting recent-ish change is "writeback: speed up writeback of
> big dirty files."  When I revert the change to __sync_single_inode the
> problem appears to go away and background writeout proceeds at disk
> speed.  Interestingly, that code is in the git commit [2], but not in
> the post to LKML. [3]  This is may not be the fix, but it makes this
> test behave better.

I'm fairly sure this is not fixing the root cause - but putting it at the head
rather than the tail of the queue causes the error not to starve wb_kupdate
for nearly so long - as long as we keep the queue full, the bug is hidden.

M.
--
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/