Hi,
On my 2.2 kernel I could set the DMA flag to 1(on) but on 2.4 it seems to me giving
problem.
------------------------------------------------------
debian:~# /sbin/hdparm -c1 -d1 -m16 -X66 /dev/hda
/dev/hda:
setting 32-bit I/O support flag to 1
setting multcount to 16
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
setting xfermode to 66 (UltraDMA mode2)
multcount = 16 (on)
I/O support = 1 (32-bit)
using_dma = 0 (off)
debian:~#
------------------------------------------------------
Any ideas ?
Regards
Rajesh
Ashwin D saw fit to inform me that:
>
>Hi folks
>
>- Any link you can think of ??? Anyone else with kernel (2.2 & 2.4 ) and
>reiserfs who can run the hdparm tests and let me know?
>
>Thanks
>Ashwin
>
>On Tuesday 06 February 2001 09:53, you wrote:
>> Hi
>>
>> Why is it that my DMA performance under the kernel 2.4.x is worse than the
>> one under 2.2? I have attached the stats below the mail- information and
>> test results under both kernels.
>>
>> I use the following option under rc to set dma ;
>> /sbin/hdparm -c1 -d1 -m16 -X66 /dev/hda
>>
>> I use resierfs, Iam disappointed that 2.4 results are about 1/3rd and need
>> to know if I have to tune something or add some kernel compilation option.
>> I only know that I have not turned on Raid on kernel 2.4 which is on in
>> 2.2. I thought it was not reqd with one hdd - could it be the cause. Any
>> other option relating to HDDs?
>>
>> Anybody with similair results?
>>
>> Thanks for your time.
>> Ashwin
--
Rajesh Fowkar
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