On Wed, Jun 20 2007, Andrew Morton wrote: > Perhaps our queues are too long - if the VFS _does_ back off, it'll take > some time for that to have an effect. > > Perhaps the fact that the queue size knows nothing about the _size_ of the > requests in the queue is a problem.
It's complicated, the size may not matter a lot. 128 sequential 512kb IO may complete faster than 128 random 4kb IO's. > Back away even further here. > > What user-visible problem(s) are we attemping to fix? I'd like innocent-app-doing-little-write-or-fsync not being stalled by big-bad-app-doing-lots-of-dirtying. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/