linux-kernel - Re: [Patch v4 3/3] net: Restrict receive packets queuing to housekeeping CPUs

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Message-ID: <20200626111401.GE4817@hirez.programming.kicks-ass.net>
Date:   Fri, 26 Jun 2020 13:14:01 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nitesh Narayan Lal <nitesh@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        frederic@...nel.org, mtosatti@...hat.com, juri.lelli@...hat.com,
        abelits@...vell.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, rostedt@...dmis.org, mingo@...nel.org,
        tglx@...utronix.de, davem@...emloft.net, akpm@...ux-foundation.org,
        sfr@...b.auug.org.au, stephen@...workplumber.org,
        rppt@...ux.vnet.ibm.com, jinyuqi@...wei.com,
        zhangshaokun@...ilicon.com
Subject: Re: [Patch v4 3/3] net: Restrict receive packets queuing to
 housekeeping CPUs

On Thu, Jun 25, 2020 at 06:34:43PM -0400, Nitesh Narayan Lal wrote:
> From: Alex Belits <abelits@...vell.com>
> 
> With the existing implementation of store_rps_map(), packets are queued
> in the receive path on the backlog queues of other CPUs irrespective of
> whether they are isolated or not. This could add a latency overhead to
> any RT workload that is running on the same CPU.
> 
> Ensure that store_rps_map() only uses available housekeeping CPUs for
> storing the rps_map.
> 
> Signed-off-by: Alex Belits <abelits@...vell.com>
> Signed-off-by: Nitesh Narayan Lal <nitesh@...hat.com>

Dave, ACK if I route this?