linux-kernel - Re: [PATCH V3 0/4] genirq/affinity: irq vector spread among online CPUs as far as possible

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Message-ID: <alpine.DEB.2.21.1803090011150.1454@nanos.tec.linutronix.de>
Date:   Fri, 9 Mar 2018 00:20:09 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Ming Lei <ming.lei@...hat.com>
cc:     Artem Bityutskiy <dedekind1@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Laurence Oberman <loberman@...hat.com>
Subject: Re: [PATCH V3 0/4] genirq/affinity: irq vector spread among online
 CPUs as far as possible

On Thu, 8 Mar 2018, Ming Lei wrote:
> Actually, it isn't a real fix, the real one is in the following two:
> 
> 	0c20244d458e scsi: megaraid_sas: fix selection of reply queue
> 	ed6d043be8cd scsi: hpsa: fix selection of reply queue

Where are these commits? Neither Linus tree not -next know anything about
them....

> This patchset can't guarantee that all IRQ vectors are assigned by one
> online CPU, for example, in a quad-socket system, if only one processor
> is present, then some of vectors are still assigned by all offline CPUs,
> and it is a valid case, but still may cause io hang if drivers(hpsa,
> megaraid_sas) select reply queue in current way.

So my understanding is that these irq patches are enhancements and not bug
fixes. I'll queue them for 4.17 then.

Thanks,

	tglx