linux-kernel - Re: Got iperf regression while intel_iommu is on, how to cut the cost of cache flushing

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Message-ID: <CABawtvMpY6BGRnjq1FvrmyBSqSnqOnRFH_hS8gOTNMxy9JVfGw@mail.gmail.com>
Date:	Fri, 1 Nov 2013 14:12:06 +0800
From:	Ethan Zhao <ethan.kernel@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ashok Raj <ashok.raj@...el.com>, Shaohua Li <shaohua.li@...el.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Got iperf regression while intel_iommu is on, how to cut the cost
 of cache flushing

Eric,
   Thanks, hope it could kill the most pain of the regression.  I will
try them and report the result.

Ethan

> You might hit a known problem for some 10Gb links.
>
> 3.12-rc6 has the fixes already, and stable has some pending backports :
>
> commit 95bd09eb27507691520d39ee1044d6ad831c1168
> tcp: TSO packets automatic sizing
>
> commit c9eeec26e32e087359160406f96e0949b3cc6f10
> tcp: TSQ can use a dynamic limit
>
> Please check that current 3.12-rc6 is OK ?
>
>
>
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