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Re: NAPI, e100, and system performance problem

To: "David S. Miller" <davem@xxxxxxxxxxxxx>
Subject: Re: NAPI, e100, and system performance problem
From: Robert Olsson <Robert.Olsson@xxxxxxxxxxx>
Date: Sat, 23 Apr 2005 22:50:08 +0200
Cc: hadi@xxxxxxxxxx, ak@xxxxxx, gnb@xxxxxxx, akepner@xxxxxxx, jesse.brandeburg@xxxxxxxxx, netdev@xxxxxxxxxxx, davem@xxxxxxxxxx, Robert.Olsson@xxxxxxxxxxx
In-reply-to: <1114197689.7978.68.camel@localhost.localdomain>
References: <C925F8B43D79CC49ACD0601FB68FF50C03A633C7@orsmsx408> <Pine.LNX.4.61.0504180943290.15052@linux.site> <1113855967.7436.39.camel@localhost.localdomain> <20050419055535.GA12211@sgi.com> <m1hdhzyrdz.fsf@muc.de> <1114173195.7679.30.camel@localhost.localdomain> <20050422172108.GA10598@muc.de> <1114193902.7978.39.camel@localhost.localdomain> <20050422183004.GC10598@muc.de> <1114196487.7978.65.camel@localhost.localdomain> <20050422120714.35f56e76.davem@davemloft.net> <1114197689.7978.68.camel@localhost.localdomain>
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Well remember I did some CPU-measurements with different variants of the 
tulip driver long time ago while discussing this with Manfred.

Yellow: NAPI no intr. mitigation
Red: old HW-Flow w. intr. mitigation
Blue: NAPI w. intr. mitigation
Purple: A tulip variant doing all work in ->poll w. intr. mitigation

Your coalicing patch for tg3 should roughly be like moving from the yellow 
to the purple line. I'll guess we soon got the answer... Maybe I have to 
upgrade the lab with some recent broadcom cards too.


GIF image


Cheers.
                                                --ro
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