Jens Axboe wrote:
> On Tue, Jan 09 2007, Vasily Tarasov wrote:
>
>> Jens Axboe wrote:
>>
>>> Tom, you are correct, the 'B' is a bounce and not a backmerge. Vasily,
>>> you may want to look into your setup, bouncing is very harmful to io
>>> performance.
>>>
>>>
>>>
>> Hello again,
>>
>> My node has 4GB RAM and by default block queue limit
>> is high memory boundary:
>> blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
>> Driver doesn't set other bounce limit (like most drivers),
>> so I have bounces.
>>
>> Seems, that all people with more then 1GB Memory
>> should have such situation (except lucky beggars with "appropriate"
>> drivers),
>> am I right?
>>
>
> What driver do you use? By far the most common ones do support highmem
> IO (like IDE/SATA/SCSI, etc).
>
>
My driver is NVIDIA Serial ATA.
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