Date: Tue, 24 Jun 2003 08:28:14 +0100 From: Karl Pielorz <kpielorz@tdx.co.uk> To: Shawn Ramsey <shawn@cpl.net>, freebsd-questions@freebsd.org Subject: Re: Network Performace Message-ID: <512328439.1056443294@Study.tdx.com> In-Reply-To: <009701c339ed$b89daf40$85dd75d8@shawn> References: <009701c339ed$b89daf40$85dd75d8@shawn>
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--On 23 June 2003 18:12 -0700 Shawn Ramsey <shawn@cpl.net> wrote: > I am having some issues with network performance and am wondering if > anyone has any suggestions... the box in question has 2 100BT interfaces, > and an Intel (em driver) fiber Gigabit. The Gigabit connects to a switch, > and the two fast-e are WAN connections to our ISP(s). This box seems to > be using an awful lot of CPU cycles relative to the traffic it is > pushing, which is around 65-70Mb inbound, and 20-30 Mb/outbound(on > average), which seems to be about its limit. This is an Athlon XP 1500 > box, 256MB RAM, top shows 90+% interrupt usage, CPU usually has about > 5-10% idle. Gigabit is on a 32-bit bus, and Gigabit is on an IRQ shared > with unused USB and onboard NIC which is also not used. Should I be able > to push more than 100Mb sec with such a system? It is not doing anything > else, no NAT, one IPFW rule. OS is FreeBSD 4.7-RELEASE. All depends how big the packets are etc. - 90% interrupt time is fairly typical of x86/PC kit shoveling lots of small packets. Try looking into FreeBSD's "polling" mode - i.e. interrupt free Network cards. If your shifting a lot of small packets (such as online gaming stuff etc.) - you may find your milage pretty limited using standard PC kit - as the x86 architecture wasn't really designed for shifting lots of small packets around [as I've seen many a time in the past :(] -Kp
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