Date: Wed, 20 Oct 2004 16:14:18 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Oleg Gawriloff" <barzog@telecom.by>, "Eric Anderson" <anderson@centtech.com> Cc: freebsd-performance@freebsd.org Subject: Re: decreasing interrupt CPU load Message-ID: <00eb01c4b6b7$7a04c5a0$b3db87d4@multiplay.co.uk> References: <004001c4b69d$80e21f40$0c0210ac@ADMIN1><41766350.4080901@centtech.com> <006001c4b6ad$38a8cac0$0c0210ac@ADMIN1>
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I can confirm 82558 using fxp is very good especially with link0.
Using polling an em based card in the same machine ( dual PIII 800Mhz )
will out perform the fxp but only just 16MB/s vs 12MB/s.
Without polling the em is significantly slower than the fxp which appears
to be mainly due to interrupt load.
Note: test results from a single transfer using ftp from a win32 P2.4Ghz
connected directly via Intel(R) PRO/1000.
Steve
----- Original Message -----
From: "Oleg Gawriloff" <barzog@telecom.by>
> EA> I've had really great performance with the em NICs, and bad experiences
> EA> with bge's (the hardware is flaky).
> OK, we'll try. Is there any problems with any of supported chipsets in
> em-driver with polling? There many negative answer about polling support in
> fxp on 82550, and good answers about 82558 and 82559 with fxp-driver.
> EA> Also - it's possible that your bus is the bottleneck - depending on how
> EA> many NICs you have, the type of bus, and the motherboard.
> Intel SCB2, integrated NIC on PCI 33Mhz bus. We use only one NIC, with five
> 802.1q vlan sub-interfaces configured. Is there any ideas how can I diagnose
> bottlenecks on bus?
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