linux-kernel - Re: [Patch v2 0/3] iommu: reduce spinlock contention on fast path

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Message-ID: <20191217094304.GF8689@8bytes.org>
Date:   Tue, 17 Dec 2019 10:43:04 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [Patch v2 0/3] iommu: reduce spinlock contention on fast path

On Thu, Nov 28, 2019 at 04:48:52PM -0800, Cong Wang wrote:
> This patchset contains three small optimizations for the global spinlock
> contention in IOVA cache. Our memcache perf test shows this reduced its
> p999 latency down by 45% on AMD when IOMMU is enabled.

Sounds nice. Can you please re-send with Robin Murphy on Cc? Robin, can
you have a look at these IOVA changes please?

Thanks,

	Joerg