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SubjectRe: [Bug #13463] Poor SSD performance
> Bug-Entry	:
> Subject : Poor SSD performance
> Submitter : Jake <>
> Date : 2009-06-05 17:37 (3 days old)

Hi Jake,

Could you collect some blktrace data for the dd commands on new/old

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


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