[THIN] Re: FW: info HP/Proliant performance problems.. solved
- From: "Ruben Spruijt" <Ruben.Spruijt@xxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Tue, 16 Nov 2004 19:19:15 +0100
Hi,
Only once ;-(
I am making the mentioned setting as default in new environments..
Ruben
________________________________
Van: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] Namens
Luchette, Jon
Verzonden: Tuesday, November 16, 2004 2:10 PM
Aan: 'thin@xxxxxxxxxxxxx'
Onderwerp: [THIN] Re: FW: info HP/Proliant performance problems.. solved
Have you ever seen this happen with HP NC7780 NICs?
/jL
-----Original Message-----
From: Ruben Spruijt [mailto:Ruben.Spruijt@xxxxxxxxxxxx]
Sent: Friday, November 12, 2004 5:00 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] FW: info HP/Proliant performance problems.. solved
FYI
Ruben,
If you have any Servers with HP NC7781 NIC's installed (Hp DL 380's, DL
360's and others), you may experience excessive retransmits, Outlook
hangs, file copy performance issues, cluster failovers, etc.
Cause:
The driver defaults to "Offload TCP transmit Checksum" and "Offload Ip
Transmit
Checksum". This is a performance enhancement designed to relieve the TCP
and IP
components of the IP checksum calculation overhead and assign that duty
to the NIC.
Normally this is a preferred method of operation. The HP NC7781 NICS
periodically
miscalculate the TCP checksum. This causes connection timeouts
periodically and
more importantly, Outlook hangs between 10 and 20 seconds. With the
latest firmware
and drivers installed, the issue is still prevalent. The box that
receives a
response with an incorrectly calculated checksum simply throws the
malformed
response away, never delivering the data to the application.
Resolution:
In the Netcard driver configuration dialog box, disable Offload checksum
calculations. This will allow the TCP and IP components to calculate
their own
checksums.This change does not require a reboot or involve a service
interruption, normal
change control procedures should of course, always be followed!
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