linux-kernel - RE: [PATCH 5/6] staging: hv: Increased storvsc ringbuffer and max_io

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Message-ID: <8AFC7968D54FB448A30D8F38F259C56223FE59CB@TK5EX14MBXC114.redmond.corp.microsoft.com>
Date:	Wed, 4 Aug 2010 03:23:09 +0000
From:	Hank Janssen <hjanssen@...rosoft.com>
To:	Greg KH <gregkh@...e.de>
CC:	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'devel@...verdev.osuosl.org'" <devel@...verdev.osuosl.org>,
	"'virtualization@...ts.osdl.org'" <virtualization@...ts.osdl.org>,
	"Haiyang Zhang" <haiyangz@...rosoft.com>
Subject: RE: [PATCH 5/6] staging: hv: Increased storvsc ringbuffer and
 max_io_requests


>>And than Greg KH spoke these words:
>>On Tue, Aug 03, 2010 at 05:31:55PM +0000, Hank Janssen wrote:
> >From: Hank Janssen <hjanssen@...rosoft.com>
> >
> >Increased storvsc ringbuffer and max_io_requests. This now more 
> >closely mimics the numbers on Hyper-V.
>
>What do you mean by this?  The max provided by the hypervisor?

Max_IO is set to double from what it was before, Hyper-V allows it and
We have had appliance builder requests to see if it was a problem to increase
The number.

Ringbuffer size for storvsc is now increased because I have seen 
A few buffer problems on extremely busy systems. They where 
Set pretty low before. And since max_io_requests is increased I
Really needed to increase the buffer as well.

>> And will allow more IO requests to take place for the SCSI driver.
>
>Which means what, better throughput?  Or just more outstanding requests and the same speed overall?

It means better throughput of high load systems, else you get buffer
Contention. 

Thanks,

Hank.

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