From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <39C6262B.A54933C2@agelectronics.co.uk> Date: Mon, 18 Sep 2000 15:26:52 +0100 From: Adrian Cox MIME-Version: 1.0 To: paulus@linuxcare.com.au CC: linuxppc-dev@lists.linuxppc.org Subject: Re: zeroing pages in the idle task? References: <200009122018.WAA00786@piglet.grunz.lu> <200009131951.VAA00816@piglet.grunz.lu> <14784.22458.21233.588776@argo.linuxcare.com.au> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Paul Mackerras wrote: > It would be cleaner to have the page mapped with a non-cacheable > mapping while the idle task is clearing it but you still have to be > careful about cache inconsistencies, particularly if the page is > mapped twice and one mapping is cacheable and the other isn't. It might be interesting to try using a DMA engine on MPC 106/107 systems to clear pages in the background. I've seen some simulations which suggest that this could be a big win, but I'd have to spend a while digging through the IEEE archives to find them again. - Adrian Cox, AG Electronics ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/