Anne Dirkse wrote:
> Douglas --
>
> I am experiencing the exact same set of problems, except that I'm just
> beginning to experience them, so I haven't done any real testing to get
> to the specifics of what is going on and the exact performance
> difference that I am experiencing between Solaris and Linux, however,
> there is a noticable slowness even with a single connected client.
> My setup is:
> * Solaris 8
> * All machines also on same 100MB Ethernet
> * Standalone Tomcat
> * Using our company's Sparc boxes (500Mhz Sparc) -- only have tried
> these
> * No performance difference amongst browsers (IE5, Netscape 4.7)
> * Tried JDK 1.2.2 and 1.3, no difference
> * Patched Solaris as recommended for Java setup, no difference
>
By any chance, have you tried hitting the system from another Solaris
box? There is a TCP/IP stack mis-match problem (due to Win32 having a
less sophisticated implementation) that can cause an idle of up to 0.5
seconds.
>From http://www.sun.com/sun-on-net/performance/tcp.slowstart.html:
"Only configurations with clients that use a simplistic delayed ACK implementation,
e.g. Windows/NT, will exhibit the idle time problem when talking to a Solaris server."
They recommend doing the following as root to patch this for Win32 clients:
# ndd -set /dev/tcp tcp_slow_start_initial 2
Give this a shot and let us know if it clears up your problem.
--kd
