linux-kernel - RE: [PATCH v2] storvsc: Set up correct queue depth values for IDE devices

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Message-ID: <MWHPR2101MB072916BAB0F56AA2CD8C444BCEB50@MWHPR2101MB0729.namprd21.prod.outlook.com>
Date:   Thu, 19 Apr 2018 04:59:12 +0000
From:   Long Li <longli@...rosoft.com>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>
CC:     "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        Long Li <longli@...uxonhyperv.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "James E . J . Bottomley" <JBottomley@...n.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] storvsc: Set up correct queue depth values for IDE
 devices

> Subject: Re: [PATCH v2] storvsc: Set up correct queue depth values for IDE
> devices
> 
> 
> Long,
> 
> > Can you take a look at the following patch?
> 
> >> > + max_sub_channels =
> >> > + 		(num_cpus - 1) / storvsc_vcpus_per_sub_channel;
> 
> What happens if num_cpus = 1?

If num_cpus=1, we don't have any sub channels.

The host offers one sub channel for VM with 5 CPUs, after that it offers an additional sub channel every 4 CPUs.

The primary channel is always offered.

> 
> --
> Martin K. Petersen	Oracle Linux Engineering