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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4B0A9631.2030705@gmail.com>
Date:	Mon, 23 Nov 2009 15:03:29 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <hawk@...u.dk>
CC:	Jesper Dangaard Brouer <hawk@...x.dk>,
	Linux Kernel Network Hackers <netdev@...r.kernel.org>,
	Robert Olsson <robert@...julf.net>
Subject: Re: Strange CPU load when flushing route cache (kernel 2.6.31.6)


> 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.

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html