Date: Mon, 17 Mar 2003 12:02:23 +0200 From: "Petri Helenius" <pete@he.iki.fi> To: "Terry Lambert" <tlambert2@mindspring.com> Cc: <freebsd-current@FreeBSD.ORG> Subject: Re: mbuf cache Message-ID: <001d01c2ec6c$4fa80630$932a40c1@PHE> References: <0ded01c2e295$cbef0940$932a40c1@PHE> <20030304164449.A10136@unixdaemons.com> <0e1b01c2e29c$d1fefdc0$932a40c1@PHE> <20030304173809.A10373@unixdaemons.com> <0e2b01c2e2a3$96fd3b40$932a40c1@PHE> <20030304182133.A10561@unixdaemons.com> <0e3701c2e2a7$aaa2b180$932a40c1@PHE> <20030304190851.A10853@unixdaemons.com> <001201c2e2ee$54eedfb0$932a40c1@PHE> <20030307093736.A18611@unixdaemons.com> <008101c2e4ba$53d875a0$932a40c1@PHE> <3E68ECBF.E7648DE8@mindspring.com> <3E70813B.7040504@he.iki.fi> <3E750D52.FFA28DA2@mindspring.com> <048601c2ec59$0696dd30$932a40c1@PHE> <3E75820D.C7EC28E1@mindspring.com>
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> If you are asking for paper references, then I can at least tell > you where to start; go to: http://citeseer.nj.nec.com/cs and look > for "Jeff Mogul", "DEC Western Research Laboratories", "Mohit > Aron", "Peter Druschel", "Sally Floyd", Van Jacobson", "SCALA", > "TCP Rate halving", "Receiver Livelock", "RICE University", > "Duke University", "University of Utah". That will at least get > you most of the papers. Then follow the references to the other > papers. > These seem quite network-heavy, I was more interested in references of SMP stuff and how the coherency is maintained and what is the overhead of maintaining the coherency in read/write operations and how alignment helps/screws you with different word-sizes in IA32 architechture. Writing a coarse SMP memory benchmark should be easy, I wonder if it has been done? Judging from the profiling I´ve done on both kernel and userland things, copying memory around is among the most expensive things to do in modern multi-GHz machines. Doing arithmetic to decrease memory bandwidth requirements pays off very well. The thing I´m still wondering about is how expensive is writing compared to reading. Pete To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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