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: <CABawtvOcUzWQ_UOnB-NtkD6AxyfXKCO2pU3+hjrH-kHX+jV5nQ@mail.gmail.com>
Date:	Fri, 6 Dec 2013 23:26:03 +0800
From:	Ethan Zhao <ethan.kernel@...il.com>
To:	jiang.liu@...el.com
Cc:	Ashok Raj <ashok.raj@...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

Jiang,
    Could you help to take a look such performance issue about Intel
IOMMU, seems you go back  this field of Intel.  Is it possible to
eliminate the performance side effect of mapping and unmapping
operation ? some context information, please refer to the first mail
of this loop.

Thanks,
Ethan
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