[c-nsp] Windows server hangs connected to 3750

[Sigurbjörn Birkir Lárusson]

One issue I've seen with 2003R2 is that it implemented Chimney (TCP checksum
offloading) by default which has caused us endless grief with really bad TCP
performance.  It seems network drivers shipped with 2003R2 were not really
ready for this chance and many of them perform very badly even under little
TCP load.

You can try

netsh int ip set chimney disable

To turn it off and see if the situation improves

BR,
Sibbi


On 26.11.2008 14:36, "Frank Bulk" <frnkblk at iname.com> wrote:

> What NIC(s) do you have in the server?
> 
> Frank
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Vigar, Damien
> Sent: Tuesday, November 25, 2008 11:18 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Windows server hangs connected to 3750
> 
> Hi all,
> 
> We are experiencing an issue with Windows 2003R2 servers connected to our
> 3560/3750 switches via a 1000T SFP GBIC. The servers appear to hang,
> responding to a ping but not to anything else. It looks to us like an issue
> with the servers, but our server administrator insists that it must be the
> GBIC/switch combination.
> 
> We've put the servers in question back onto fast ethernet ports, and haven't
> seen any problems in the meantime. Other sites' servers are running fine on
> the same GBIC/switch combination.
> 
> We've tried to find anything relating to this issue online, with no luck.
> Any ideas on where to go next?
> 
> 
> Cheers,
> 
> Damien
> 
> 
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