linux-kernel - Re: [PATCH 1/1] scsi: storvsc: Spread interrupts when picking a channel for I/O requests

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Message-ID: <yq160793a6i.fsf@oracle.com>
Date:   Tue, 06 Feb 2018 19:39:17 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     "Michael Kelley \(EOSG\)" <Michael.H.Kelley@...rosoft.com>
Cc:     KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "martin.petersen\@oracle.com" <martin.petersen@...cle.com>,
        "longi\@microsoft.com" <longi@...rosoft.com>,
        "JBottomley\@odin.com" <JBottomley@...n.com>,
        "devel\@linuxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi\@vger.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 1/1] scsi: storvsc: Spread interrupts when picking a channel for I/O requests


Michael,

> Update the algorithm in storvsc_do_io to look for a channel starting
> with the current CPU + 1 and wrap around (within the current NUMA
> node). This spreads VMbus interrupts more evenly across CPUs. Previous
> code always started with first CPU in the current NUMA node, skewing
> the interrupt load to that CPU.

Applied to 4.16/scsi-fixes. Thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering