After playing with this a bit more (testing this time against tomcat 7.0.27)
the ajpPacketSize has zero effect on the speed.
Downloading a large file through mod_jk to tomcat looks like this:
2012-05-08 16:01:22 (15.0 MB/s) - “sol-11-1111-text-x86.iso.8” saved
[450799616/450799616]
Downloading the same large file directly through apache looks like:
2012-05-08 16:01:58 (19.3 MB/s) - “sol-11-1111-text-x86.iso.11” saved
[450799616/450799616]
the numbers are pretty consistent. So apache still beats tomcat by a
good chunk but it's much much better than with tomcat 5.0 where the
through tomcat numbers were about half that.
I'm still wondering if there's something that can be tweaked in the MS
TCP/IP stack to bring the two together closer.
Andy
On 05/08/2012 02:06 PM, Andy Wang wrote:
On 05/07/2012 06:50 PM, Andy Wang wrote:
On 05/07/2012 06:06 PM, André Warnier wrote:
Considering your setup, it should not be too hard to set up a
download of the same file file directly from Tomcat (through its
HTTP Connector), to compare that with your two previous ways. This
way, you could make sure if it is Tomcat, or the mod_jk/AJP link
which is the issue.
Also, still considering your setup, it should be possible to
configure things so that these file downloads are handled directly
by Apache httpd, since that seems to satisfy your expectations.
mod_jk "JkMount/JkUnMount" rules (*) should make that possible, no ?
Have to be a bit careful not to introduce security holes, and I am
assuming that the files are static (which may be wrong here).
(*) or the <Location ..> + "setHandler jakarta-servlet"
configuration variation
Thanks for the http connector idea. I forgot about that. The primary
reason why i'm using tomcat to download a static file is really for
testing purposes to confirm performance between mod_jk and direct
apache. we have servlets that stream content files that see the same
massive performance hit so in our actual use case it's not static
files :(. I'm thinking this would be a valid test to help at least
tweak mod_jk to it's potential.
We've checked and double checked the buffering code of the servlets
and it all looks fine AND the performance is fine on Linux and the
speed characteristics are identical to serving static files through
tomcat + mod_jk so I'm hoping that it's an apples to apples comparison.
Andy
Through the HTTP connector the performance is similar to apache
direct. 30mb/s
So there's something interesting going on specifically ajp.
Andy
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