Messages in this thread | | | Date | Wed, 10 Jun 2009 14:37:46 +0800 | From | Wu Fengguang <> | Subject | Re: [Bug #13463] Poor SSD performance |
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> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=13463 > Subject : Poor SSD performance > Submitter : Jake <ellowitz@uchicago.edu> > 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
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