> > Should there be a default scheduler per filesystem? As some filesystems > > may perform better/worse with one over another? > > It's currently perDevice, and should probably be extended to perMount. Hi, per mount is going to be "not funny". I assume the situation you are aiming for is the "3 partitions on a disk, each wants its own elevator". The way the kernel currently works is that IO requests the filesystem does are first flattened into an IO for the entire device (eg the partition mapping is done) and THEN the IO scheduler gets involved to schedule the IO on a per disk basis. The 2.4 kernel did this the other way around, and it was really a bad idea (no fairness, less optimal scheduling all around due to less visibility into what the disk is really doing, several hardware properties such as TCQ depth that affect scheduling IOs are truely per disk not per partition etc etc) So I don't think it's likely that per mount is really an option right now.. Greetings, Arjan van de Ven -- if you want to mail me at work, send mail to arjan (at) linux.intel.com - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
