On Fri, Aug 08, 2014 at 11:56:46PM -0400, Theodore Ts'o wrote: > Interesting results! > > I noticed that the 1TB SSD did seem to suffer when you went from > multi-threaded to single-threaded. Was this a SATA-attached or > USB-attached SSD? And any insights about why the SSD seemed to > require threading for better performance when using readaead? PCIE, and it might simply be having issues. :/ One thing I haven't looked into is how exactly the kernel maps IO requests to queue slots -- does each CPU get its own pile of slots to use up? I _think_ it does, but it's been a few months since I poked at mq. Hmm... max_sectors_kb=128, which isn't unusually odd. Guess I'll keep digging. The other disks seems fairly normal, at least. --D > > - Ted > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
