linux-kernel - Re: [PATCH V2] x86/tboot: add an option to disable iommu force on

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Message-ID: <20170427160419.GX5077@suse.de>
Date:   Thu, 27 Apr 2017 18:04:19 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Shaohua Li <shli@...com>
Cc:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        gang.wei@...el.com, hpa@...ux.intel.com, kernel-team@...com,
        ning.sun@...el.com, srihan@...com, alex.eydelberg@...el.com
Subject: Re: [PATCH V2] x86/tboot: add an option to disable iommu force on

On Thu, Apr 27, 2017 at 08:41:20AM -0700, Shaohua Li wrote:
> Sorry, I wrote the wrong data. With iommu the pps is 6M pps, and without it, we
> can get around 20M pps. XDP is much faster than normal network workloads. The
> test uses 64 bytes. We tried other sizes in the machine (not 8 bytes though),
> but pps doesn't change significantly. With different package size, the peek pps
> is around 7M with iommu, then the NIC starts to drop package. CPU util is very
> low as I said before. Without iommu, the peek pps is around 22M.

Ah, these numbers makes more sense.

Thanks,

	Joerg