RE: [RFC v2 PATCH 6/7] dmaengine: xilinx_dma: Use tasklet_hi_schedule for timing critical usecase

[Radhey Shyam Pandey]

> -----Original Message-----
> From: Lars-Peter Clausen <lars@xxxxxxxxxx>
> Sent: Thursday, April 15, 2021 12:41 PM
> To: Radhey Shyam Pandey <radheys@xxxxxxxxxx>; vkoul@xxxxxxxxxx;
> robh+dt@xxxxxxxxxx; Michal Simek <michals@xxxxxxxxxx>
> Cc: dmaengine@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; git
> <git@xxxxxxxxxx>
> 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