Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 beta 3/9/83; site uthub.UUCP Path: utzoo!utcsrgv!utai!uthub!thomson From: thomson@uthub.UUCP (Brian Thomson) Newsgroups: net.unix-wizards Subject: Re: instrumenting cache followup and request for info Message-ID: <173@uthub.UUCP> Date: Tue, 7-Aug-84 11:09:09 EDT Article-I.D.: uthub.173 Posted: Tue Aug 7 11:09:09 1984 Date-Received: Tue, 7-Aug-84 17:34:44 EDT References: <1269@nsc.UUCP> Organization: CSRG, University of Toronto Lines: 14 From nsc!chuqui ... > Our 4.2 780 is still > running DZ's using the dma simulation code. We are getting an enormous > number of interrupts generated (with 8 DZ boards, who wouldn't???). Each > interrupt seems to be dropping through the Swtch process scheduler routine, > which sets up a new process for the CPU to play with. Are you sure you're not mistaking idle time for "setting up a new process"? The idle loop is in the Swtch routine. On a 4.2 780 here, I once put 25000 chars/sec out through the DZ pseudo-DMA code and had cpu to spare. -- Brian Thomson, CSRI Univ. of Toronto {linus,ihnp4,uw-beaver,floyd,utzoo}!utcsrgv!uthub!thomson