So I cannot reproduce the slow down to 4-5MB/s on the same VM I was able
to reproduce it on once I copied the VM to an adequate vmware server.
But I do see some neat numbers in case people care.
I ran with ab -5 directly against apache, against a url mapped to ajp as
well as direct to the http connectors.
The numbers were consistent between tomcat 5.0, 5.5, 6.0 and 7.0 so I'm
only going to post one set of numbers for tomcat.
This is against a windows XP SP3 with no sendbuffersize, tcpbuffersize
or scaling window tuning:
Direct to apache http:
Transfer rate: 21925.90 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 0.3 1 1
Processing: 19593 20077 474.0 20045 20855
Waiting: 1 2 0.6 2 3
Total: 19593 20078 474.1 20046 20856
Through AJP:
Transfer rate: 36732.95 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 0.2 1 1
Processing: 10662 11984 879.6 12227 12975
Waiting: 4 5 0.5 5 5
Total: 10663 11984 879.7 12227 12976
Direct to tomcat http:
Transfer rate: 30968.31 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 1.6 0 4
Processing: 11326 14214 2655.1 15565 16952
Waiting: 3 5 1.6 5 7
Total: 11326 14215 2654.3 15565 16952
Note how much better the both the tomcat results are than direct
apache. Most interestingly, note how much better AJP is than direct
tomcat HTTP connector. That was quite unexpected.
Here are the results from a Windows 2008 system on the same vm host:
Direct to apache http:
Transfer rate: 57968.69 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 0.1 1 1
Processing: 7453 7594 181.8 7575 7890
Waiting: 2 12 18.5 6 45
Total: 7453 7594 181.8 7576 7890
Through AJP:
Transfer rate: 31532.82 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 0.2 1 1
Processing: 10723 13960 2813.3 15795 16409
Waiting: 3 5 3.1 4 10
Total: 10724 13961 2813.4 15795 16410
Direct to Tomcat http:
Transfer rate: 37742.45 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.1 0 1
Processing: 10974 11664 452.1 11812 12192
Waiting: 2 14 25.2 4 59
Total: 10974 11664 452.2 11813 12192
Tomcat http averaged better times, BUT ajp was able to perform faster at
times. Direct HTTP to apache is way faster though but I think that's to
be expected.
So realistically, I think the 2008 numbers make sense to me and the XP
numbers show that XPs tcp stack is a piece of crap (which I think alot
of people already know).
I'm not sure what to make of the customer reports of the slow downs but
at this point, I'm going to have to ask them to use something like
ab.exe to do the downloads instead of Internet Explorer (most of them
use IE to do it). Maybe there's some stupidity with IE.
Anyways, I'm closing the book on this (with a bookmark just in case) but
wanted to provide the numbers in case people were curious what I got.
Thanks,
Andy
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