netdev - Re: [PATCH net-next 2/2] sunvnet: Re-check for a VIO_DESC_READY data descriptor after short udelay()

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Message-Id: <20140902.135902.167580446823265395.davem@davemloft.net>
Date:	Tue, 02 Sep 2014 13:59:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	sowmini.varadhan@...cle.com
Cc:	raghuram.kothakota@...cle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] sunvnet: Re-check for a VIO_DESC_READY
 data descriptor after short udelay()

From: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Date: Tue, 02 Sep 2014 06:27:54 -0400

> when there are no more packets coming, the extra 12 microsecond
> delay is not that big of a deal anyway.

How much other work could the cpu do in those 12 microseconds?

That's almost 3000 cpu cycles on a T4.

I understand your argument, and the fact that there are some existing
pieces of code doing this already, so I'll think about it some more.

Thanks.
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