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From: Wolfram Sang <wsa@the-dreams.de>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc: ulf.hansson@linaro.org, wsa+renesas@sang-engineering.com,
	linux-mmc@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH 0/3] mmc: renesas_sdhi_internal_dmac: improve performance by using IOMMU
Date: Fri, 26 Apr 2019 11:46:11 +0200	[thread overview]
Message-ID: <20190426094611.GD1031@kunai> (raw)
In-Reply-To: <1556255930-18188-1-git-send-email-yoshihiro.shimoda.uh@renesas.com>

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Hi Shimoda-san,

thanks for working on this!

> Please refer to the end of this email about the performance.

Yes, nice improvements, great!

> (I beleive if the performance is improved, the CPU load is also increased.)

I do wonder about this a bit, though. IPMMU and DMA shouldn't be that
much expensive for the CPU, or? Am I overlooking something?

Kind regards,

   Wolfram


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  parent reply	other threads:[~2019-04-26  9:46 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-26  5:18 [PATCH 0/3] mmc: renesas_sdhi_internal_dmac: improve performance by using IOMMU Yoshihiro Shimoda
2019-04-26  5:18 ` [PATCH 1/3] mmc: tmio: add init_card ops Yoshihiro Shimoda
2019-04-26  9:15   ` Wolfram Sang
2019-04-26  9:45   ` Simon Horman
2019-04-26  9:56     ` Wolfram Sang
2019-04-26 10:17       ` Simon Horman
2019-04-26  5:18 ` [PATCH 2/3] mmc: tmio: No memory size limitation if runs on IOMMU Yoshihiro Shimoda
2019-04-26  8:09   ` Sergei Shtylyov
2019-04-26  9:17     ` Wolfram Sang
2019-05-07  7:13       ` Yoshihiro Shimoda
2019-04-26  9:45   ` Simon Horman
2019-04-26  5:18 ` [PATCH 3/3] mmc: renesas_sdhi_internal_dmac: use multiple segments if possible Yoshihiro Shimoda
2019-04-26  9:37   ` Wolfram Sang
2019-05-07  7:27     ` Yoshihiro Shimoda
2019-04-26  9:45   ` Simon Horman
2019-04-26  9:46 ` Wolfram Sang [this message]
2019-05-07  8:58   ` [PATCH 0/3] mmc: renesas_sdhi_internal_dmac: improve performance by using IOMMU Yoshihiro Shimoda
2019-05-08  4:28     ` Yoshihiro Shimoda

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