From: Church, Chuck (cchurch@netcogov.com)
Date: Tue Apr 12 2005 - 15:35:59 GMT-3
I agree TCP is a bad throughput test for WANs if using a single flow.
Running concurrent file copies can make it a valid test tool though.
UDP is a better choice at the protocol level, but I believe apps like
TFTP do acks at a higher level, making it a poor choice as well. But
this case seems to be a host issue, configuration, or a switch hardware
issue.
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch@netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
-----Original Message-----
From: simon hart [mailto:simon.hart@btinternet.com]
Sent: Tuesday, April 12, 2005 1:47 PM
To: Church, Chuck; Wayne Bellward; Cisco certification
Subject: RE: File Transfer Speeds
Agreed,
The throughput should be around 1.1MB if maximum TCP window size. The
point
being made is that TCP is not the best measure of throughput. Having
said
that 50 to 85KB does indicate some problem somewhere other than just TCP
S.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Church, Chuck
Sent: 12 April 2005 16:33
To: Wayne Bellward; Cisco certification
Subject: RE: File Transfer Speeds
Wayne,
Your problem appears to be config or hardware related. 50 or 85
kb/sec is absurdly slow. TCP isn't the problem, not with a RTT of well
under 1ms between the hosts. I'd take a look at all the duplex settings
first. TCP shouldn't have a problem on a LAN, until you get to
gigabit-speed. HTH.
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch@netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Wayne Bellward
Sent: Tuesday, April 12, 2005 7:12 AM
To: Cisco certification
Subject: File Transfer Speeds
Hi All,
I have two 3550EMI's connected via a 10Mb Full duplex crossover, the
link is a 802.1q trunk and I only have about four VLANS running. When
I do an FTP of a 10Mb binary file between two hosts one on each switch
in different VLANS I get file transfer speeds of about 50KBs. If I
put the hosts on the same 3550 I get transfer speeds of about 85KBs,
CEF is enabled but either way I would expect to get transfer speeds
much greater than those I am getting.
The 3550 has a 8.8Gbps switch fabric and a throughput of 4.4Gbps can
anyone explain to me why this is happening? I don't think there is a
problem with the switches or the hosts but get the impression I am
missing a fundamental aspect of switching.
Many Thanks,
Wayne
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