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From Igor Cicimov <>
Subject Re: [users@httpd] Some VirtualHosts extremely slow, others very fast
Date Thu, 09 Dec 2010 06:15:13 GMT
Check the dns resolution for the xyz host.

Sent from my phone

On Dec 9, 2010 1:24 PM, "Craig A. James" <> wrote:

We operate one public web site and about 20 private web sites.  They're all
the same server, running the same Apache server instance

Most customers get excellent performance, but two customers get terrible
response times, but only on *some* of the VirtualHosts.  They get excellent
responses from our public site, but the very same page served from a private
site can take over a minute to load.

The VirtualHosts are configured identically except for the "Allow from" and
"ServerName" directives.  As far as I can tell, everything else is identical
(except the specific database it uses, but for these tests we're only
loading static HTML pages).

It appears that "" VirtualHosts always work, but "" VirtualHosts give problems.

Examining TCP/IP traffic using WireShark, it looks like the slow virtual
hosts are dropping ACK packets.  Each TCP/IP conversation starts out fast,
but then there's a 5-second gap in the middle of every HTTP response.  Yet
if the very same user accesses a different VirtualHost, there is no problem
at all.

We've been trying to figure this out for weeks with no luck.  Any ideas
would be greatly appreciated.


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