[Bug 15014] New: Poor performance on O2 Micro carbus bridge (OZ6933)

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Sat Jan 9 09:10:31 EST 2010


           Summary: Poor performance on O2 Micro carbus bridge (OZ6933)
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.32
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PCMCIA
        AssignedTo: linux-pcmcia at lists.infradead.org
        ReportedBy: frodone at gmail.com
        Regression: No

Created an attachment (id=24493)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=24493)
lspci -vv

Since kernel 2.6.32 i noticed degraded performance on network file transfers
from my 8139too pcmcia card (3MB/sec instead of 11MB/sec). I bisected till

1ff84890b62b20823b3697a6041bbec1b5280cee is the first bad commit
commit 1ff84890b62b20823b3697a6041bbec1b5280cee
Author: Tomas Kovacik <nail at nodomain.sk>
Date:   Sun Jul 26 22:04:58 2009 +0200

    pcmcia: disable prefetch/burst for OZ6933

    Problems have been reported [1], so disable prefetch/burst, to be on the


    Signed-off-by: Tomáš KováÄik <nail at nodomain.sk>
    Signed-off-by: Wolfram Sang <w.sang at pengutronix.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>

:040000 040000 bc4841745f3cba3e1cf1c952d4ce987572fa40f8
8b5f282e917ce1b11b499f81ad219a71487faccd M      drivers

I agree with the "be on the safe side" statement, but...

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