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    SubjectRe: [Bug #13463] Poor SSD performance
    > 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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