yes. in the kernel source tree do this:
/usr/src/linux/include/linux/socket.h
#define SOMAXCONN 511
there is also something else you can change to up your max processes,
but i dont recall where that file is. this should take care of the
SYN problem tho.
if your cpu load is a 40% tho you've got other problems. i would swap
the 50GB disk for an ultra wide scsi if its not already. if its ide
that could be part of your cpu load.
-jacob
On Fri, Aug 04, 2000 at 08:14:24PM +0200, Support wrote:
>
> Hi,
>
> I have an server (Pentium III 750 MHz, 500 MB RAM, 50 Gigabyte Disk)
> running with vpopmail, qmail, vchkpw and fastforward on SUSE 6.4.
> There are 90.000 virtual users on that machine with nearly the same
> amount of aliases in the fastforward.cdb.
>
> But there is one problem. I offer pop3 and smtp service on
> this machine and have aproximatly 1500 till 2000 connection
> at the same time on the machine (netstat -a). 63 percent are pop3
> connections and 32 percent smtp. Rest not important.
> And I can see only 120 till 130 established connections of those
> 1500-2000 connections at the same time. The rest (80 %) is in
> status SYN_RECV. CPU-load is around 40 percent.
>
> Is there a trick to get more established connection at the same
> time on the server, because the other 80 percent were waiting for
> the mail to deliver or to receive.
>
> Do I have to manipulate the network stack or something ?
>
> Please mail me any idea.....
>
>
>
>
