linux-kernel - Re: [PATCH] scsi: storvsc: Prefer returning channel with the same CPU as on the I/O issuing CPU

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Message-ID: <yq1ldlnfov7.fsf@ca-mkp.ca.oracle.com>
Date: Mon, 06 Oct 2025 22:05:36 -0400
From: "Martin K. Petersen" <martin.petersen@...cle.com>
To: longli@...ux.microsoft.com
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang
 <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
        Dexuan Cui
 <decui@...rosoft.com>,
        "James E.J. Bottomley"
 <James.Bottomley@...senPartnership.com>,
        "Martin K. Petersen"
 <martin.petersen@...cle.com>,
        James Bottomley <JBottomley@...n.com>, linux-hyperv@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Long Li <longli@...rosoft.com>
Subject: Re: [PATCH] scsi: storvsc: Prefer returning channel with the same
 CPU as on the I/O issuing CPU


Long,

> When selecting an outgoing channel for I/O, storvsc tries to select a
> channel with a returning CPU that is not the same as issuing CPU. This
> worked well in the past, however it doesn't work well when the Hyper-V
> exposes a large number of channels (up to the number of all CPUs). Use
> a different CPU for returning channel is not efficient on Hyper-V.

Applied to 6.18/scsi-staging, thanks!

-- 
Martin K. Petersen