> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13463 > Subject : Poor SSD performance > Submitter : Jake <ellowitz@xxxxxxxxxxxx> > Date : 2009-06-05 17:37 (3 days old) Hi Jake, Could you collect some blktrace data for the dd commands on new/old kernels? dd if=/dev/sda of=/dev/null bs=1M count=1024 iflag=direct dd if=/dev/sda of=/dev/null bs=1M count=1024 You need to install the blktrace tool and run these commands: cd /dev/shm blktrace /dev/sda # do this while dd is running # ^C to interrupt blkparse sda Package: blktrace Description: utilities for block layer IO tracing blktrace is a block layer IO tracing mechanism which provides detailed information about request queue operations up to user space. There are Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
