lkml.org 
[lkml]   [2005]   [Jul]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Date
    SubjectREGRESSION in 2.6.13-rc1: Massive slowdown with Adaptec SCSI

    Hi,
    I have a server with a:
    SCSI storage controller: Adaptec AHA-3960D / AIC-7899A U160/m (rev 01)
    Subsystem: Adaptec AHA-3960D U160/m

    connected to 14
    Vendor: MAXTOR Model: ATLAS15K_36SCA Rev: DTA0

    7 on each channel.

    On 2.6.12 a simple 'dd' write test gives 70 Meg/second:

    cage # time dd of=/dev/null if=/dev/sdl bs=1024k count=100
    100+0 records in
    100+0 records out
    104857600 bytes transferred in 1.555210 seconds (67423431 bytes/sec)

    real 0m1.557s
    user 0m0.001s
    sys 0m0.770s


    On 2.6.13-rc1 the same test takes just short on 1 minute and reports
    slightly less than 2 M/Second.

    cage # time dd of=/dev/null if=/dev/sdl bs=1024k count=100
    100+0 records in
    100+0 records out
    104857600 bytes transferred in 54.576592 seconds (1921293 bytes/sec)

    real 0m54.578s
    user 0m0.000s
    sys 0m0.360s

    I'm happy to try patches or perform other tests.

    NeilBrown
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-07-05 03:11    [W:0.019 / U:95.696 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site