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

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Message-ID: <4803BA06.1000908@intel.com>
Date:	Mon, 14 Apr 2008 13:09:42 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	Andi Kleen <andi@...stfloor.org>, netdev@...r.kernel.org,
	e1000-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/5] e1000e: Add interrupt moderation run-time ethtool
 interface

Jeff Garzik wrote:
> 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.

yes I think that's a good addition, and might hook better into power management
and other high-level configuration tools.

I'm all for that :)

Auke
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