netdev - Re: [net-next PATCH V5] qdisc: bulk dequeue support for qdiscs with TCQ_F

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Message-Id: <20140930.142038.235338672810639160.davem@davemloft.net>
Date:	Tue, 30 Sep 2014 14:20:38 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jhs@...atatu.com
Cc:	brouer@...hat.com, netdev@...r.kernel.org, therbert@...gle.com,
	eric.dumazet@...il.com, hannes@...essinduktion.org, fw@...len.de,
	dborkman@...hat.com, alexander.duyck@...il.com,
	john.r.fastabend@...el.com, dave.taht@...il.com, toke@...e.dk
Subject: Re: [net-next PATCH V5] qdisc: bulk dequeue support for qdiscs
 with TCQ_F_ONETXQUEUE

From: Jamal Hadi Salim <jhs@...atatu.com>
Date: Tue, 30 Sep 2014 07:07:37 -0400

> Note, there are benefits as you have shown - but i would not
> consider those to be standard use cases (actully one which would
> have shown clear win is the VM thing Rusty was after).

I completely disagree, you will see at least decreased cpu utilization
for a very common case, bulk single stream transfers.

> For this reason my view is that i should be able to disable via
> ifdef bulking (yes, I know DaveM hates ifdefs ;->).

Vehemntly _disagree_. :)

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