From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <13426df10708081408x48559821m1be70cacf3cc62bb@mail.gmail.com> Date: Wed, 8 Aug 2007 14:08:28 -0700 From: "ron minnich" To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu> Subject: Re: [9fans] Bay Area Plan 9 Users Group Meeting (August '07) In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <13426df10708081341p63bd6637qdafd5d1766471108@mail.gmail.com> Topicbox-Message-UUID: a0957d1c-ead2-11e9-9d60-3106f5b1d025 On 8/8/07, Charles Forsyth wrote: > > Fix is to give it lots of dma segments so that you can stay ahead of > > the traffic. > > but is that then guaranteed, or just a matter of luck? That's a great question. I believe it is a matter of luck. But if you get the interrupt, and you put the new pointers in the dma struct "quickly", and it has not wrapped around, well, you're in luck! ron p.s. Actually, it does not matter, lguest is going to replace its I/O with the paravirt IO standard ops in the next release.