Christoph Hellwig, on 07/30/2010 04:57 PM wrote:
On Fri, Jul 30, 2010 at 04:46:12PM +0400, Vladislav Bolkhovitin wrote:
I supposed, with write back cache you did the queue drain after
request(s) with ordered requirements, correct? Did you also do the queue
drain in the same places with write through caching?
Using the queue drains in both cases. I can only imagine keeping the
queue drained over the cache flush instead of just a few small I/Os
has nasty side effects.
Sorry, I can't follow you here. What was the load pattern difference
between the tests in the way how the backend device saw it? I thought,
it was only in absence of the cache flush commands (SYNCHRONIZE_CACHE?)
in the write through case, but looks like there is something more different?
Thanks,
Vlad
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
