Date: Fri, 14 Oct 2005 20:12:39 +0200 From: Kurt Jaeger <lists@complx.LF.net> To: Danial Thom <danial_thom@yahoo.com> Cc: freebsd-isp@freebsd.org, Drew Linsalata <drew@gothambus.com> Subject: Re: Multiport NICs - VLAN and Polling Support? Message-ID: <20051014181239.GC62233@complx.LF.net> In-Reply-To: <20051014161100.33377.qmail@web33306.mail.mud.yahoo.com> References: <20051013204631.51300.qmail@mail.gothambus.com> <20051014161100.33377.qmail@web33306.mail.mud.yahoo.com>
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Hi! > polling is almost never a performance advantage > for ethernet, as virtually all modern controllers > have some sort of interrupt moderation built-in. We had the case on fbsd 5.4p7 with SMP where bge drivers produced much slower throughput if we did not use polling. We measured using ttcp and the difference was from 2-3Mbyte/sec to 11 Mbyte/sec. Yes, it used more CPU, but for that increase in throughput, it was worth the expense. So it looks a bit strange from my part of the world to. -- MfG/Best regards, Kurt Jaeger 15 years to go ! LF.net GmbH fon +49 711 90074-23 pi@LF.net Ruppmannstr. 27 fax +49 711 90074-33 D-70565 Stuttgart mob +49 171 3101372
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