linux-kernel - RE: [RFC v2 PATCH 6/7] dmaengine: xilinx_dma: Use tasklet_hi

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Message-ID: <BY5PR02MB652096A6F787E277BFD404A2C7349@BY5PR02MB6520.namprd02.prod.outlook.com>
Date:   Fri, 11 Jun 2021 18:30:24 +0000
From:   Radhey Shyam Pandey <radheys@...inx.com>
To:     Lars-Peter Clausen <lars@...afoo.de>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Michal Simek <michals@...inx.com>
CC:     "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        git <git@...inx.com>
Subject: RE: [RFC v2 PATCH 6/7] dmaengine: xilinx_dma: Use tasklet_hi_schedule
 for timing critical usecase

> -----Original Message-----
> From: Lars-Peter Clausen <lars@...afoo.de>
> Sent: Thursday, April 15, 2021 12:41 PM
> To: Radhey Shyam Pandey <radheys@...inx.com>; vkoul@...nel.org;
> robh+dt@...nel.org; Michal Simek <michals@...inx.com>
> Cc: dmaengine@...r.kernel.org; devicetree@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; git
> <git@...inx.com>
> Subject: Re: [RFC v2 PATCH 6/7] dmaengine: xilinx_dma: Use
> tasklet_hi_schedule for timing critical usecase
> 
> On 4/9/21 7:56 PM, Radhey Shyam Pandey wrote:
> > Schedule tasklet with high priority to ensure that callback processing
> > is prioritized. It improves throughput for netdev dma clients.
> Do you have specific numbers on the throughput improvement?
IIRC there was ~5% performance improvement but I did that a long back
on an older kernel 4.8 and after that onward I always checked overall
performance (having all optimization applied). In next version i will 
redo incremental profiling and capture improvement % in the commit 
description.

Thanks,
Radhey