Re: [patch] 4GB I/O, 2nd edition

[Marcelo Tosatti]

On Mon, 28 May 2001, Jens Axboe wrote:

> Hi,
> 
> One minor bug found that would possibly oops if the SCSI pool ran out of
> memory for the sg table and had to revert to a single segment request.
> This should never happen, as the pool is sized after number of devices
> and queue depth -- but it needed fixing anyway.
> 
> Other changes:
> 
> - Support cpqarray and cciss (two separate patches)
> 
> - Cleanup IDE DMA on/off wrt highmem
> 
> - Move run_task_queue back again in __wait_on_buffer. Need to look at
>   why this hurts performance.

It decrease performance of what in which way ?

Thanks