From: Greg KH on
On Tue, Aug 03, 2010 at 05:31:55PM +0000, Hank Janssen wrote:
> From: Hank Janssen <hjanssen(a)microsoft.com>
>
> Increased storvsc ringbuffer and max_io_requests. This now more closely mimics
> the numbers on Hyper-V. And will allow more IO requests to take place for the SCSI driver.
>
> Signed-off-by:Hank Janssen <hjanssen(a)microsoft.com>
> Signed-off-by:Haiyang Zhang <haiyangz(a)microsoft.com>

Again with the trailing spaces :(
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From: Greg KH on
On Tue, Aug 03, 2010 at 05:31:55PM +0000, Hank Janssen wrote:
> From: Hank Janssen <hjanssen(a)microsoft.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?

> 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?

thanks,

greg k-h
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From: Hank Janssen on

>>And than Greg KH spoke these words:
>>On Tue, Aug 03, 2010 at 05:31:55PM +0000, Hank Janssen wrote:
> >From: Hank Janssen <hjanssen(a)microsoft.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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From: Greg KH on
On Wed, Aug 04, 2010 at 03:23:09AM +0000, Hank Janssen wrote:
>
> >>And than Greg KH spoke these words:
> >>On Tue, Aug 03, 2010 at 05:31:55PM +0000, Hank Janssen wrote:
> > >From: Hank Janssen <hjanssen(a)microsoft.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.

All good, care to included this in the changelog comment when you resend
this whole series?

thanks,

greg k-h
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