netdev - Re: Is 3.18 patch "The tcp: TSO packets automatic sizing" will cause to Troughput drop when enable NO_HZ_IDEL or HIGH_RES

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Message-ID: <1399394474.15399.22.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 06 May 2014 09:41:14 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	V JobNickname <workofv@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Is 3.18 patch "The tcp: TSO packets automatic sizing" will
 cause to Troughput drop when enable NO_HZ_IDEL or HIGH_RES_TIMERS ?

On Tue, 2014-05-06 at 09:30 -0700, Eric Dumazet wrote:

> I cant see any effect for this patch explaining a 50% reduction in
> speed, unless a special qdisc setup maybe.

Oh wait, a buggy driver could explain the problem.

Some drivers really expected TX completion to happen as a side effect of
subsequent transmits.

You'll have to give more details on the configuration you are using.

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