Lee Revell wrote:
> On Sat, 2006-02-18 at 13:55 -0800, Brad Fuller wrote:
>
>> Lee Revell wrote:
>>
>>>
>>> This helps a lot:
>>>
>>> echo 64 > /sys/block/hdc/queue/max_sectors_kb
>>>
>>> (replace hdc with your drive, repeat for all of them)
>>>
>>> Try that before you resort to patching the kernel.
>>>
>>> IIRC PD is not the best designed RT app (GUI stuff can delay the RT
>>> threads), but this might have improved lately.
>>>
>>>
>> What is given up by setting this to 64?
>>
>
> Presumably, a little bit of disk performance. Low latency always
> involves giving up some performance, because it's a matter of doing some
> kind of work in smaller chunks. I have not measured it.
>
>
>> I have a sata set at 1024 and an
>> IDE at 128. Certainly they were set at these settings for a reason (I
>> hope a good reason)
>>
>>
>
> Heh, that's a funny story - it's actually the farthest thing from a good
> reason I can imagine. The maximum IO size is determined by whether
> 48-bit addressing is in use which is determined by - wait for it - the
> size of the drive! The sata drive is bigger than the IDE right?
>
right. The SATA drive is 250GB.
The IDE is 20GB
Received on Sun Feb 26 20:15:26 2006
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