At this point, my only recommendation would be to upgrade the kernel to the current RedHat 7.2 patch release of 2.4.18-7.x There have been a ton of things fixed in 9 kernel releases and this could be related to one of them.
-----Original Message----- From: Randy Watler [mailto:rwatler@;finali.com] Sent: 11 November, 2002 10:34 AM To: Tomcat Users List Subject: Re: Rare request delay of 100 seconds Jeff, Thanks for the response. I did want to clarify... we are seeing very rare requests that are delayed by 100 seconds, (not 100ms). Anything measured in seconds seems to be very slow for protocol issues like these, no? Randy Watler Finali Corporation Jeff Tulley wrote: > Could it simply be the Nagle problem? There are two algorithms commonly used with TCP/IP, trying to make things more efficient, delayed ack, and Nagle's algorithm. Unfortunately they don't work well together. You can turn off Nagle's algorithm, but that could cause a lot of "tinygrams" on the wire. Same thing with delayed acks (there the "tinygram" is the extra acks). I don't know if RedHat has implemented a fix for the problem, but there are a few proposed fixes, one of them called the "Doupnik" algorithm. > > I'm not sure if this would be your problem, but it sure sounds like it. Anytime that I've seen somebodies requests coming in at such a regular interval (200 ms is typical, but 100 ms is common also), it has almost always turned out to be this problem. > > Here are some links from a colleague on the problem and a potential solution: > > -------------------------------------------------------- > > Look here for sample source code. > > http://netlab1.usu.edu/pub/misc/newpolicy.sources/ > > Look here for the explanation of the problem and the solution > > http://netlab1.usu.edu/pub/misc/draft-doupnik-tcpimpl-nagle-mode-00.txt > > -------------------------------------------------------- > > Jeff Tulley ([EMAIL PROTECTED]) > (801)861-5322 > Novell, Inc., the leading provider of Net business solutions > http://www.novell.com > > >>> [EMAIL PROTECTED] 11/9/02 9:25:53 AM >>> > George, > > Oops! I was off by one on the RedHat version. Here is the whole story: > > RedHat 7.2 > Linux version: 2.4.9-31smp > gcc version: 2.96 > > Sorry I forgot to include this information up front! > > Randy Watler > Finali Corporation > > "Sexton, George" wrote: > > What kernel version are you running? > > -- > To unsubscribe, e-mail: <mailto:tomcat-user-unsubscribe@;jakarta.apache.org> > For additional commands, e-mail: <mailto:tomcat-user-help@;jakarta.apache.org> > > -- > To unsubscribe, e-mail: <mailto:tomcat-user-unsubscribe@;jakarta.apache.org> > For additional commands, e-mail: <mailto:tomcat-user-help@;jakarta.apache.org> -- To unsubscribe, e-mail: <mailto:tomcat-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:tomcat-user-help@;jakarta.apache.org>
