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: 4+ 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 17:25 ` James Bottomley [this message]
2016-06-09 22:01 ` Olaf Hering
2016-06-15 2:07 ` Martin K. Petersen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1465493159.2259.14.camel@linux.vnet.ibm.com \
--to=jejb@linux.vnet.ibm.com \
--cc=devel@linuxdriverproject.org \
--cc=haiyangz@microsoft.com \
--cc=kys@microsoft.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=martin.petersen@oracle.com \
--cc=olaf@aepfle.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox