Subject: Re: Strange CPU load when flushing route cache (kernel 2.6.31.6)

From: Eric Dumazet <[email-masked]>
Date: Mon, 23 Nov 2009 15:03:29 +0100

> grep LowTotal /proc/meminfo
> LowTotal:         747080 kB
> 
> What does that mean?  Is it bad? What should I run on a 32-bit
> system/kernel?

If you have more than 1GB of physical ram, and use your machine as a router, you might
compile a 2GB/2GB User/Kernel kernel, to get twice available RAM for kernel
and more IP route entries (if needed)

make menuconfig
--> Processor type and features
  --> Memory split
    --> 2G/2G

> Can you recommend any other /proc/sys/ tuning options?

Really hard to say without exact context of use :)

> 
> Does my kernel boot option rhash_entries=262143 make sense anymore?
> Or do we adjust the hash bucket size dynamically these days?
> 

Its not dynamic yet.