Wireshark-users: Re: [Wireshark-users] TCP retransmissions from Windows file server
Check if the Windows Server TCP chimney is turned on. Some old switches
don't support this advanced feature well. Try to turn it off and re-test
On Mon, 9 Mar 2009, Hansang Bae wrote:
At 10:50 AM 2/19/2009, Hans van Staveren wrote:
While figuring out the (slightly disappointing) performance from some
Windows file servers in a corporate environment I found some TCP
retransmissons using wireshark. Looking at the 'netstat -s -p tcp' output
from the servers themselves I found a TCP segment retransmission rate of
about 1%. My feeling is that this is a lot, given the fact that the whole
network consists of three Cisco switches and two pieces of fiber.
1) Is my gut feeling right about 1% retransmissions being a lot in this
environment?
2) The server guys told me they were using the HP teams driver on the
servers, and that they heard that this would be a problem with Cisco
switches. This does not ring any bell with me.
Others might have already chimed in, but 1% packet loss on a three switch network is pretty high.
Are you sure you don't have a duplex mismatch? Rule that out first.
hsb
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