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Date: Tue, 22 Apr 2008 16:31:34 +0400
From: Igor Sysoev <is@rambler-co.ru>
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Subject: Re: bge loader tunables
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On Tue, Apr 22, 2008 at 12:20:38AM +0400, Igor Sysoev wrote:

> Finally I have tested your second (without debug stuff) patch in
> production environment (~45K in/out packets) on FreeBSD 7.0-STABLE.
> I think it should be commited.
> 
> I use my usual static settings in /etc/sysctl.conf:
> 
> dev.bge.0.dyncoal_max_intr_freq=0
> #
> dev.bge.0.rx_coal_ticks=500
> dev.bge.0.tx_coal_ticks=10000
> dev.bge.0.rx_max_coal_bds=64
> dev.bge.0.tx_max_coal_bds=128
> # apply the above parameters
> dev.bge.0.program_coal=0
> 
> and have about only 1700-1900 interrupts per second.
> 
> The only issue was at boot time:
> 
> dev.bge.0.dyncoal_max_intr_freq: 10000 -> 0
> dev.bge.0.rx_coal_ticks: 0 -> 500
> dev.bge.0.tx_coal_ticks: 1000000 -> 10000
> dev.bge.0.rx_max_coal_bds: 128 -> 64
> dev.bge.0.tx_max_coal_bds: 384 -> 128
> ...
> bge0: flags =8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
> ...
> Local package initialization:
> ...
> dev.bge.0.rx_coal_ticks: 150 -> 500
> 
> When disabling dyncoal_max_intr_freq at bge UPing resets rx_coal_ticks to 150.  

I has to use
dev.bge.0.program_coal=1

in /etc/sysctl.conf, otherwise /etc/rc.d/sysctl does not call it at all.


-- 
Igor Sysoev
http://sysoev.ru/en/