Query about slow read performance

Jeremy Allison jra at samba.org
Tue Aug 27 23:50:14 UTC 2019

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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