Date: Wed, 23 Nov 2005 17:44:19 +0200 From: Atanas Yankov <xds@LanGame.Net> To: freebsd-net@freebsd.org Subject: Re: bge driver, how to increase performance? Message-ID: <43848E53.3010002@LanGame.Net> In-Reply-To: <43848005.2000004@jku.at> References: <43848005.2000004@jku.at>
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for bge0
#ifconfig bge0 mtu 9000
N.B MTU has to be consistent on LAN and you need Gigabit equipment that can handle jumbo frames
for fxp0
#ifconfig fxp0 link0
Some chip revisions have loadable microcode which can be used to
reduce the interrupt load on the host cpu. Not all boards have
microcode support. Setting the link0 flag with ifconfig(8) will
download the microcode to the chip if it is available.
for all system you cand try
net.inet.ip.fastforwarding=1
But do this carefully there some problems on 4.x with fastforwarding
feature and dummynet and dot.1q vlans on 5.x its seems to work :))
br,
CCNP Atanas Yankov
Network Administrator
AngelSoft Ltd.
Ferdinand Goldmann wrote:
> Hello,
>
> I have a 3com 3c996-SX card running under FreeBSD 5.4-STABLE.
> Performance is quite ok so far, but interrupt load is very high.
> (Machine is working as a traffic shaping device/firewall)
>
> # vmstat -i
> interrupt total rate
> irq18: bge0 153244636 5014
> irq27: fxp0 102056377 3339
>
> Often, interrupt load will hit almost 100%. I guess the bge driver
> does not support polling, but I remember reading somewhere that it
> supports interrupt moderation? How would I enable this? On the em
> driver, this could be done via sysctl. Does anyone have hints on
> performance improvement concerning interrupt load?
>
> TIA
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