From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: Warning - running *really* short on DMA buffers while doing file transfers Date: Fri, 27 Sep 2002 09:45:09 +0200 Sender: linux-kernel-owner@vger.kernel.org Message-ID: <20020927074509.GA860@suse.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: To: Matthew Jacob Cc: "Justin T. Gibbs" , "Pedro M. Rodrigues" , Mathieu Chouquet-Stringer , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-scsi@vger.kernel.org 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