Date: Thu, 10 Apr 2003 00:14:35 -0400 From: David Gilbert <dgilbert@velocet.ca> To: "Jin Guojun [DSD]" <j_guojun@lbl.gov> Cc: freebsd-performance@freebsd.org Subject: Re: tcp_output starving -- is due to mbuf get delay? Message-ID: <16020.61355.551242.159558@canoe.velocet.net> In-Reply-To: <3E94A8C4.3A196E42@lbl.gov> References: <3E94A22D.174321F0@lbl.gov> <3E94A8C4.3A196E42@lbl.gov>
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>>>>> "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). Dave. -- ============================================================================ |David Gilbert, Velocet Communications. | Two things can only be | |Mail: dgilbert@velocet.net | equal if and only if they | |http://daveg.ca | are precisely opposite. | =========================================================GLO================
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