On 12/8/10 10:15 PM, Igor Cicimov wrote:
Check the dns resolution for the xyz host.
There is no problem with DNS. All of the subdomains use the wildcard
*.ourdomain.com, which resolves to both www and xzy. The problem isn't with
DNS. Each TCP/IP conversation starts instantly. But with xyz.ourdomain.com,
every HTTP GET request ends up with a five-second delay in the middle of the
TCP/IP stream. It's very consistent.
Thanks,
Craig
Sent from my phone
On Dec 9, 2010 1:24 PM, "Craig A. James" <cja...@emolecules.com
<mailto:cja...@emolecules.com>> 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 (2.2.14-5ubuntu8.3).
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 "www.ourdomain.com <http://www.ourdomain.com>" VirtualHosts always work, but
"xyz.ourdomain.com <http://xyz.ourdomain.com>" 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.
Craig
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