Date: Thu, 10 Apr 2003 07:31:25 -0500 From: Eric Anderson <anderson@centtech.com> To: David Gilbert <dgilbert@velocet.ca> Cc: "Jin Guojun \[DSD\]" <j_guojun@lbl.gov> Subject: Re: tcp_output starving -- is due to mbuf get delay? Message-ID: <3E95641D.1080100@centtech.com> References: <3E94A22D.174321F0@lbl.gov> <3E94A8C4.3A196E42@lbl.gov> <16020.61355.551242.159558@canoe.velocet.net>
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David Gilbert wrote: >>>>>>"Jin" == Jin Guojun <[DSD]" <j_guojun@lbl.gov>> writes: >>>>> > > Jin> Some details was left behind -- The machine is 2 GHz Intel P4 > Jin> with 1 GB memory, so the delay is not from either CPU or lack of > Jin> memory. > > I just want to quickly jump in with the comment that our GigE tests of > routing through FreeBSD have exposed several-order-of-magnitude > differences by changing ram/motherboard/which-slot-the-card-is-in. > > Do not assume that a fast CPU is the key. We went through 10 > motherboards to commission the current routers ... and sometimes > faster cpus would route slower (in various combinations of > motherboards and RAM). Wow - this is very interesting. I have two machines with GigE in them, one has 6 gige nics (intel pro/1000T server), in a dual Xeon 1.5Ghz (P4), with 2gb of ram. I haven't put it into production yet, so if there are any tests I can do, let me know. It would be good to know the pitfalls before I bring it up live.. :) Eric -- ------------------------------------------------------------------ Eric Anderson Systems Administrator Centaur Technology Attitudes are contagious, is yours worth catching? ------------------------------------------------------------------
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