Date: Tue, 11 Mar 1997 07:14:47 +1100 From: Bruce Evans <bde@zeta.org.au> To: dg@root.com, luigi@labinfo.iet.unipi.it Cc: bag@sinbin.demos.su, hackers@freebsd.org Subject: Re: Q about 100Mb ether cards Message-ID: <199703102014.HAA11658@godzilla.zeta.org.au>
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>> been able to get it to work. The Pro/100B is well supported; it's what I'm >> using in wcarchive and I haven't had any problems. It consumes about half >> the CPU time that the de driver does and has about the same level of > >that's curious though, since both do DMA from/to mbufs. What CPU >overhead are we talking about, 1% or 10% ? On a P5/133 with a 21040 (driven by de0), total network overhead for ttcp -t is 10-15%. The idle overhead is about 11% (systat reports 6-7% Sys and 3-4% Intr, and a process that doesn't do any memory accesses slows down by about 11% when ttcp is running). A process that does lots of memory accesses slows down by 15%. Bruce
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