Re: Warning - running *really* short on DMA buffers while doing file transfers

Jens Axboe
2002-09-27T07:39:59Z

On Fri, Sep 27 2002, Matthew Jacob wrote:
>
> The issue here is not whether it's appropriate to oversaturate the
> 'standard' SCSI drive- it isn't- I never suggested it was.

Ok so we agree. I think our oversaturate thresholds are different,
though.

> I'd just suggest that it's asinine to criticise an HBA for running up to
> reasonable limits when it's the non-toy OS that will do sensible I/O
> scheduling. So point your gums elsewhere.

Well I don't think 253 is a reasonable limit, that was the whole point.
How can sane io scheduling ever prevent starvation in that case? I can't
point my gums elsewhere, this is where I'm seeing starvation.

--
Jens Axboe