Re: Cache queue_congestion_on/off_threshold

Nick Piggin
2004-05-10T14:46:09Z

Jens Axboe wrote:
> On Fri, May 07 2004, Chen, Kenneth W wrote:
>
>>>>>>Jens Axboe wrote on Friday, May 07, 2004 2:39 AM
>>>
>>>On Thu, May 06 2004, Chen, Kenneth W wrote:
>>>
>>>>(3) can we allocate request structure up front in __make_request?
>>>> For I/O that cannot be merged, the elevator code executes twice
>>>> in __make_request.
>>>>
>>>
>>>Actually, with the good working batching we might get away with killing
>>>freereq completely. Have you tested that (if not, could you?)
>>
>>Sorry, I'm clueless on "good working batching". If you could please give
>>me some pointers, I will definitely test it.
>
>
> Something like this.
>

While we're doing that can we drop the GFP_ATOMIC allocation
completely?