linux-kernel - RE: [PATCH 1/1] scsi: storvsc: Reduce default ring buffer size to 128 Kbytes

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Message-ID: <DM6PR21MB1337435B5EBFF250E412C506CA560@DM6PR21MB1337.namprd21.prod.outlook.com>
Date:   Tue, 2 Apr 2019 15:58:57 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Michael Kelley <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        Long Li <longli@...rosoft.com>,
        "James.Bottomley@...senpartnership.com" 
        <James.Bottomley@...senpartnership.com>,
        "emilne@...hat.com" <emilne@...hat.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC:     Michael Kelley <mikelley@...rosoft.com>
Subject: RE: [PATCH 1/1] scsi: storvsc: Reduce default ring buffer size to 128
 Kbytes



> -----Original Message-----
> From: linux-hyperv-owner@...r.kernel.org <linux-hyperv-
> owner@...r.kernel.org> On Behalf Of Michael Kelley
> Sent: Monday, April 1, 2019 5:42 PM
> To: KY Srinivasan <kys@...rosoft.com>; martin.petersen@...cle.com; Long Li
> <longli@...rosoft.com>; James.Bottomley@...senpartnership.com;
> emilne@...hat.com; linux-hyperv@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-scsi@...r.kernel.org
> Cc: Michael Kelley <mikelley@...rosoft.com>
> Subject: [PATCH 1/1] scsi: storvsc: Reduce default ring buffer size to 128 Kbytes
> 
> Reduce the default VMbus channel ring buffer size for storvsc SCSI devices
> from 1 Mbyte to 128 Kbytes. Measurements show that ring buffer sizes above
> 128 Kbytes do not increase performance even at very high IOPS rates, so don't
> waste the memory. Also remove the dependence on PAGE_SIZE, since the ring
> buffer size should not change on architectures where PAGE_SIZE is not 4 Kbytes.
> 
> Signed-off-by: Michael Kelley <mikelley@...rosoft.com>

Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
Thank you.