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Posted to dev@trafficserver.apache.org by Chris Reynolds <sh...@gmail.com> on 2011/08/22 10:48:33 UTC
HTTP responses slower after first attempt
Hi,
I am performing some basic performance tests with Traffic Server with and
without a plugin I have written. I have noticed that if you download
(without any plugin enabled) a file then download another file that the
second download is a lot slower that the first one - over 10 times as slow.
If you then wait for about 10-20 seconds it is back to the original speed.
For example downloading an 8MB file using wget takes about 0.09s, but
downloading the same or another 8 MB file on the same server again it is
1.3s. If I bypass the proxy then the files always downloads at about 0.07s.
This seems to be affecting the overall performance of Traffic Server. Note I
am using version 3.0.0 with no caching enabled.
Has any one got any ideas?
Thank-you,
Chris Reynolds.
Re: HTTP responses slower after first attempt
Posted by Chris Reynolds <sh...@gmail.com>.
Hi,
I have managed to resolve this problem. If the
proxy.config.http.share_server_sessions config value is set to 0 then this
problem does not occur - the default is 1. When running performance tests I
was using the same server.
Is this a bug? I would have thought that sharing server sessions would make
the performance faster not slower.
Chris Reynolds.
On 22 August 2011 09:48, Chris Reynolds <sh...@gmail.com> wrote:
> Hi,
>
> I am performing some basic performance tests with Traffic Server with and
> without a plugin I have written. I have noticed that if you download
> (without any plugin enabled) a file then download another file that the
> second download is a lot slower that the first one - over 10 times as slow.
> If you then wait for about 10-20 seconds it is back to the original speed.
>
> For example downloading an 8MB file using wget takes about 0.09s, but
> downloading the same or another 8 MB file on the same server again it is
> 1.3s. If I bypass the proxy then the files always downloads at about 0.07s.
>
> This seems to be affecting the overall performance of Traffic Server. Note
> I am using version 3.0.0 with no caching enabled.
>
> Has any one got any ideas?
>
> Thank-you,
>
> Chris Reynolds.
>
>
>
Re: HTTP responses slower after first attempt
Posted by Leif Hedstrom <zw...@apache.org>.
On 08/23/2011 09:01 AM, Chris Reynolds wrote:
> Thank-you. The trunk build does seem to have fixed the problem.
Great! If you wouldn't mind, take the 3.1.0-unstable release candidate
out for a spin, and post your vote on it here.
http://people.apache.org/~zwoop/rel-candidates/
This version has the fix as well.
-- Leif
Re: HTTP responses slower after first attempt
Posted by Leif Hedstrom <zw...@apache.org>.
On 08/23/2011 09:01 AM, Chris Reynolds wrote:
> Thank-you. The trunk build does seem to have fixed the problem.
Great! If you wouldn't mind, take the 3.1.0-unstable release candidate
out for a spin, and post your vote on it here.
http://people.apache.org/~zwoop/rel-candidates/
This version has the fix as well.
-- Leif
Re: HTTP responses slower after first attempt
Posted by Chris Reynolds <sh...@gmail.com>.
Thank-you. The trunk build does seem to have fixed the problem.
On 22 August 2011 10:45, ming.zym@gmail.com <mi...@gmail.com> wrote:
> we have fixed the problem in trunk, please test with latest trunk and
> report back if it is fixed in you situation.
>
> be aware, that v3.0.1 is not fixed too, you should test the svn trunk.
>
> you may get the information from:
> https://issues.apache.org/jira/browse/TS-880
>
> thanks
>
> 在 2011-08-22一的 09:48 +0100，Chris Reynolds写道：
> > Hi,
> >
> > I am performing some basic performance tests with Traffic Server with and
> > without a plugin I have written. I have noticed that if you download
> > (without any plugin enabled) a file then download another file that the
> > second download is a lot slower that the first one - over 10 times as
> slow.
> > If you then wait for about 10-20 seconds it is back to the original
> speed.
> >
> > For example downloading an 8MB file using wget takes about 0.09s, but
> > downloading the same or another 8 MB file on the same server again it is
> > 1.3s. If I bypass the proxy then the files always downloads at about
> 0.07s.
> >
> > This seems to be affecting the overall performance of Traffic Server.
> Note I
> > am using version 3.0.0 with no caching enabled.
> >
> > Has any one got any ideas?
> >
> > Thank-you,
> >
> > Chris Reynolds.
>
>
>
Re: HTTP responses slower after first attempt
Posted by Chris Reynolds <sh...@gmail.com>.
Thank-you. The trunk build does seem to have fixed the problem.
On 22 August 2011 10:45, ming.zym@gmail.com <mi...@gmail.com> wrote:
> we have fixed the problem in trunk, please test with latest trunk and
> report back if it is fixed in you situation.
>
> be aware, that v3.0.1 is not fixed too, you should test the svn trunk.
>
> you may get the information from:
> https://issues.apache.org/jira/browse/TS-880
>
> thanks
>
> 在 2011-08-22一的 09:48 +0100，Chris Reynolds写道：
> > Hi,
> >
> > I am performing some basic performance tests with Traffic Server with and
> > without a plugin I have written. I have noticed that if you download
> > (without any plugin enabled) a file then download another file that the
> > second download is a lot slower that the first one - over 10 times as
> slow.
> > If you then wait for about 10-20 seconds it is back to the original
> speed.
> >
> > For example downloading an 8MB file using wget takes about 0.09s, but
> > downloading the same or another 8 MB file on the same server again it is
> > 1.3s. If I bypass the proxy then the files always downloads at about
> 0.07s.
> >
> > This seems to be affecting the overall performance of Traffic Server.
> Note I
> > am using version 3.0.0 with no caching enabled.
> >
> > Has any one got any ideas?
> >
> > Thank-you,
> >
> > Chris Reynolds.
>
>
>
Re: HTTP responses slower after first attempt
Posted by "ming.zym@gmail.com" <mi...@gmail.com>.
we have fixed the problem in trunk, please test with latest trunk and
report back if it is fixed in you situation.
be aware, that v3.0.1 is not fixed too, you should test the svn trunk.
you may get the information from:
https://issues.apache.org/jira/browse/TS-880
thanks
在 2011-08-22一的 09:48 +0100，Chris Reynolds写道：
> Hi,
>
> I am performing some basic performance tests with Traffic Server with and
> without a plugin I have written. I have noticed that if you download
> (without any plugin enabled) a file then download another file that the
> second download is a lot slower that the first one - over 10 times as slow.
> If you then wait for about 10-20 seconds it is back to the original speed.
>
> For example downloading an 8MB file using wget takes about 0.09s, but
> downloading the same or another 8 MB file on the same server again it is
> 1.3s. If I bypass the proxy then the files always downloads at about 0.07s.
>
> This seems to be affecting the overall performance of Traffic Server. Note I
> am using version 3.0.0 with no caching enabled.
>
> Has any one got any ideas?
>
> Thank-you,
>
> Chris Reynolds.
Re: HTTP responses slower after first attempt
Posted by "ming.zym@gmail.com" <mi...@gmail.com>.
we have fixed the problem in trunk, please test with latest trunk and
report back if it is fixed in you situation.
be aware, that v3.0.1 is not fixed too, you should test the svn trunk.
you may get the information from:
https://issues.apache.org/jira/browse/TS-880
thanks
在 2011-08-22一的 09:48 +0100，Chris Reynolds写道：
> Hi,
>
> I am performing some basic performance tests with Traffic Server with and
> without a plugin I have written. I have noticed that if you download
> (without any plugin enabled) a file then download another file that the
> second download is a lot slower that the first one - over 10 times as slow.
> If you then wait for about 10-20 seconds it is back to the original speed.
>
> For example downloading an 8MB file using wget takes about 0.09s, but
> downloading the same or another 8 MB file on the same server again it is
> 1.3s. If I bypass the proxy then the files always downloads at about 0.07s.
>
> This seems to be affecting the overall performance of Traffic Server. Note I
> am using version 3.0.0 with no caching enabled.
>
> Has any one got any ideas?
>
> Thank-you,
>
> Chris Reynolds.
Re: HTTP responses slower after first attempt
Posted by Chris Reynolds <sh...@gmail.com>.
Hi,
I have managed to resolve this problem. If the
proxy.config.http.share_server_sessions config value is set to 0 then this
problem does not occur - the default is 1. When running performance tests I
was using the same server.
Is this a bug? I would have thought that sharing server sessions would make
the performance faster not slower.
Chris Reynolds.
On 22 August 2011 09:48, Chris Reynolds <sh...@gmail.com> wrote:
> Hi,
>
> I am performing some basic performance tests with Traffic Server with and
> without a plugin I have written. I have noticed that if you download
> (without any plugin enabled) a file then download another file that the
> second download is a lot slower that the first one - over 10 times as slow.
> If you then wait for about 10-20 seconds it is back to the original speed.
>
> For example downloading an 8MB file using wget takes about 0.09s, but
> downloading the same or another 8 MB file on the same server again it is
> 1.3s. If I bypass the proxy then the files always downloads at about 0.07s.
>
> This seems to be affecting the overall performance of Traffic Server. Note
> I am using version 3.0.0 with no caching enabled.
>
> Has any one got any ideas?
>
> Thank-you,
>
> Chris Reynolds.
>
>
>