Re: Page Cache writeback too slow, SSD/noop scheduler/ext2
From: Jos Houtman
Date: Tue Mar 31 2009 - 10:10:59 EST
>> There another question I have: does the writeback go through the io
>> scheduler? Because no matter the io scheduler or the tuning done, the
>> writeback algorithm totally starves the reads.
>
> I noticed this annoying writes-starve-reads problem too. I'll look into it.
Thanks
>
>> Is there anything I can do about this behaviour by creating a better
>> interleaving of the reads and writes?
>
> I guess it should be handled in the generic block io layer. Once we
> solved the writes-starve-reads problem, the bursty-writeback behavior
> becomes a no-problem for SSD.
Yeah this was the part where I figured the io-schedulers kicked in, but
obviously I was wrong :P.
If I can do anything more to help this along, let me know.
Thanks
Jos
--
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/