Re: Disaster under heavy network load on 2.4.x

Andi Kleen
2001-06-13T09:01:51Z

Michal Margula <alchemyx@uznam.net.pl> writes:

> Hello!
>
> My friend told me to noticed you about problems I had with 2.4.x line of
> kernels. I started up from 2.4.3. Under heavy load I was getting
> messages from telnet, ping, nmap "No buffer space available". Strace
> told me it was error marked as ENOBUFS.

You probably need to increase various sysctls to handle your load.
E.g. /proc/sys/net/ipv4/tcp_mem, net/core/[rw]mem_{max,default}, neigh/
defaults/gc_thresh* (for the ARP table)

>
> First thought was it was my fault. I asked many people and nobody could
> help me. So I tried 2.4.5. It was a disaster also (should I mention few
> oopses?:>).

When you have oopses run them through ksymoops and send them to the list.

-Andi