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
___________________________________________________________________________
Sent via: Wireshark-users mailing list <wireshark-users@xxxxxxxxxxxxx>
Archives: http://www.wireshark.org/lists/wireshark-users
Unsubscribe: https://wireshark.org/mailman/options/wireshark-users
mailto:wireshark-users-request@xxxxxxxxxxxxx?subject=unsubscribe
