linux-kernel - Re: [PATCH 2/3] blk-mq: Always complete remote completions requests in softirq

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Message-ID: <20210125092908.ntugyvnbyigxpoyl@linutronix.de>
Date:   Mon, 25 Jan 2021 10:29:08 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Hannes Reinecke <hare@...e.de>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 2/3] blk-mq: Always complete remote completions requests
 in softirq

On 2021-01-25 08:32:48 [+0000], Christoph Hellwig wrote:
> Well, I put it in quotes because I'm not sure what the exact effect
> is.  But we do delay these completions to the softirq now instead of
> hardirq context, which at least in theory increases latency.  OTOH it
> might even have positive effects on the rest of the system.

The last part is/was my motivation ;)

Sebastian