On 11/20/2013 01:04 AM, Christoph Hellwig wrote: > On Tue, Nov 19, 2013 at 02:43:51PM -0700, Jens Axboe wrote: >> No, the nr_requests isn't actually relevant in the blk-mq context, the >> driver sets its own depth. For the above, it's 64 normal commands, and 2 >> reserved. The reserved would be for a flush, for instance. If someone >> attempts to queue more than the allocated number of requests, it'll stop >> the blk-mq queue and kick things into gear on the virtio side. Then when >> requests complete, we start the queue again. > > Btw, any reason we lowerered the queue depth from 128 to 64 in > virtio-blk?
No, we can easily bump it to 128 again, I think it was a leftover from where it had more queues and testing. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
