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Strange performance issue

 

 

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timnels at gmail

Oct 26, 2007, 4:48 AM

Post #1 of 3 (115 views)
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Strange performance issue

I've got a vanilla Apache 2.0 server up on RHEL4. HTML pages have a
bizarre 20 second delay in returning them to the client. Here are the
details:

1. HostNameLookups is off for this virtual host
2. I've disabled SELinux to rule that out
3. There doesn't seem to be many network collisions so I am ruling out
the network for the moment.
4. wget on the localhost of a page returns WITHOUT a delay.
5. Hitting simple Perl CGI scripts returns WITHOUT a delay (however
hitting http://my.domain.com/cgi-bin/test.pl/foo IS slow ... meaning
a URL with PATH_INFO is slow)
6. I don't have any special modules installed.
7. I have a single address listening on 8080 and a single virtual host.

Can someone give me some ideas to try and debug this?
Thanks.

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swsyah at yahoo

Oct 26, 2007, 6:13 AM

Post #2 of 3 (113 views)
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Re: Strange performance issue [In reply to]

You may want to try a network monitor to see what's actually going on. I use Network Spy on the PC. The freeware version just nags once in a while but otherwise is pretty complete. It will show all the transactions and may give some indication as to where things are going slow.

- Steve

Tim Nelson <timnels [at] gmail> wrote: I've got a vanilla Apache 2.0 server up on RHEL4. HTML pages have a
bizarre 20 second delay in returning them to the client. Here are the
details:

1. HostNameLookups is off for this virtual host
2. I've disabled SELinux to rule that out
3. There doesn't seem to be many network collisions so I am ruling out
the network for the moment.
4. wget on the localhost of a page returns WITHOUT a delay.
5. Hitting simple Perl CGI scripts returns WITHOUT a delay (however
hitting http://my.domain.com/cgi-bin/test.pl/foo IS slow ... meaning
a URL with PATH_INFO is slow)
6. I don't have any special modules installed.
7. I have a single address listening on 8080 and a single virtual host.

Can someone give me some ideas to try and debug this?
Thanks.

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timnels at gmail

Oct 26, 2007, 7:00 AM

Post #3 of 3 (111 views)
Permalink
Re: Strange performance issue [In reply to]

On 10/26/07, steve sawtelle <swsyah [at] yahoo> wrote:
> You may want to try a network monitor to see what's actually going on. I use
> Network Spy on the PC. The freeware version just nags once in a while but
> otherwise is pretty complete. It will show all the transactions and may give
> some indication as to where things are going slow.
>
> - Steve
>
>
> Tim Nelson <timnels [at] gmail> wrote:
> I've got a vanilla Apache 2.0 server up on RHEL4. HTML pages have a
> bizarre 20 second delay in returning them to the client. Here are the
> details:
>
> 1. HostNameLookups is off for this virtual host
> 2. I've disabled SELinux to rule that out
> 3. There doesn't seem to be many network collisions so I am ruling out
> the network for the moment.
> 4. wget on the localhost of a page returns WITHOUT a delay.
> 5. Hitting simple Perl CGI scripts returns WITHOUT a delay (however
> hitting http://my.domain.com/cgi-bin/test.pl/foo IS slow
> ... meaning
> a URL with PATH_INFO is slow)
> 6. I don't have any special modules installed.
> 7. I have a single address listening on 8080 and a single virtual host.
>
> Can someone give me some ideas to try and debug this?
> Thanks.
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See for more info.
> To unsubscribe, e-mail: users-unsubscribe [at] httpd
> " from the digest:
> users-digest-unsubscribe [at] httpd
> For additional commands, e-mail: users-help [at] httpd
>
>
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com

I am an idiot. Typo in the Allow line for Directory was causing a
hostname lookup.

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