From: James Bottomley <jejb@linux.vnet.ibm.com>
To: Olaf Hering <olaf@aepfle.de>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>
Cc: devel@linuxdriverproject.org, linux-kernel@vger.kernel.org,
linux-scsi@vger.kernel.org
Subject: Re: [PATCH v3] storvsc: use small sg_tablesize on x86
Date: Thu, 09 Jun 2016 10:25:59 -0700 [thread overview]
Message-ID: <1465493159.2259.14.camel@linux.vnet.ibm.com> (raw)
In-Reply-To: <20160609162553.10290-1-olaf@aepfle.de>
On Thu, 2016-06-09 at 18:25 +0200, Olaf Hering wrote:
> Reducing the sg_tablesize allows booting of 32bit kernels in VMs,
> after
> commit be0cf6ca301c61458dc4aa1a37acf4f58d2ed3d6 ("scsi: storvsc: Set
> the
> tablesize based on the information given by the host")
>
> [ 5.567138] hv_storvsc vmbus_1: adjusting sg_tablesize 0x800 ->
> 0x20
Are you really sure 32 is the correct size? That caps transfers at 128
k. Even in the dim, dark, pre-64bit (at least on x86) days, our static
limit for sg tablesize was 128 (0.5M).
I know 32 it what it had before, but the reason for the commit you
quote was to improve performance ...
James
next prev parent reply other threads:[~2016-06-09 17:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-09 16:25 [PATCH v3] storvsc: use small sg_tablesize on x86 Olaf Hering
2016-06-09 16:25 ` Olaf Hering
2016-06-09 17:25 ` James Bottomley [this message]
2016-06-09 22:01 ` Olaf Hering
2016-06-15 2:07 ` Martin K. Petersen
2016-06-15 2:07 ` Martin K. Petersen
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