Query about slow read performance

Abhidnya Joshi abhidnyachirmule at gmail.com
Tue Sep 3 17:31:33 UTC 2019

Hi Jeremy,

Thanks for your reply. Yes we do see less number of credits being asked by
problematic client compared to the other Win2k8 client.
Is there any way to increase the number of credits client can ask for
irrespective of tcp level delays/sizes in Win2k8?


On Wed, Aug 28, 2019 at 5:20 AM Jeremy Allison <jra at samba.org> wrote:

> On Fri, Aug 23, 2019 at 12:24:34PM +0530, Abhidnya Joshi via
> samba-technical wrote:
> > Hi All,
> >
> > Recently while doing single file read testing on SMB2 from our product to
> > Win2008 (as client), we saw some performance degradation.
> >
> > Although we are finding out causes in our SMB server, we can somehow see
> > this degradation when the Win2008 got security patch applied.
> >
> > *2019-03 Servicing Stack Update for Windows Server 2008 R2 for x64-based
> > Systems (KB4490628)*
> >
> > The performance drop is not observed for write but only for reads and the
> > cap seen is around 260-280 Mbps. (Earlier it was around 520 Mbps). The
> > security patch does not have anything directly related to I/O or SMB but
> > this is what we are observing.
> >
> > My question here is, has anyone observed any of such problem recently
> with
> > Win2k8 used as client?
> Nope, this is the first I've heard of it. Can you do a comparative
> wireshark trace between an unpatched client and a patched client
> to look at the differences in how they're driving the server.
> Any credit changes ?

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