netdev - Re: [PATCH 2/5] e1000e: Add interrupt moderation run-time ethtool interface

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Date:	Mon, 14 Apr 2008 15:35:42 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Auke Kok <auke-jan.h.kok@...el.com>, netdev@...r.kernel.org,
	e1000-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/5] e1000e: Add interrupt moderation run-time ethtool
 interface

Andi Kleen wrote:
> Auke Kok <auke-jan.h.kok@...el.com> writes:
> 
>> The ethtool -c / -C interface can now be used to modify the
>> irq moderation algorithm. This change does not require an
>> adapter reset and can thus be used at all times. The adapter
>> only supports changing/reading rx-usecs which has special
>> values for 0, 1 and 3:
>>
>> 0 - no irq moderation whatsoever
>> 1 - normal moderation favoring regular mixed traffic (default)
>> 3 - best attempt at low latency possible at cost of CPU
> 
> It would be nice if ethtool instead of having this as a obscure magic
> number had a higher level "--low-latency" or similar parameter
> (that could also potentially set similar settings on other NICs)

That would be fine with me -- that's one of the goals of ethtool:  make 
the setting of hardware-specific settings as generic and easy as possible.

	Jeff



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