Re: [LARTC] Which CPU for heavy traffic with much filtering/shaping?

[sawar <sawar@interia.pl>]

Hi

is there any how-to which can guide me through all available tuning options 
in /proc/ filesystem 

Pozdrawiam
Szymon Turkiewicz
> >Hi
>
> Hi
>
> >I have a router with a large number of iptables rules and some
> >extensive traffic shaping (HTB + RED + ... ) + conntrack.
>
> Performance boost tips:
>
> - Use "set" module instead of sequential iptables rules. It can lower
> cpu usage.
>
> - Use hashing filters for shaping if you're using many u32 filters.
>
> - configure conntrack to use bigger hashsize for better performance;
> i'm passing following parameter to kernel in grub to achieve this:
> ip_conntrack.hashsize\x1048575
>
> - configure routecache to use bigger to use more memory for better
> performance; i'm passing following parameter to kernel in grub to
> achieve this: rhash_entries$00000
>
> >1. What processors should I be looking for in order to achieve the
> >best routing throughput on a linux router?
>
> I've had good experiences with P4 (with and without HT), Athlon64, Xeon
> [dempsey], Xeon [woodcrest]. The last one is the best choice because of
> the large cache and architecture. I think you can use Core 2 Duo too
> if you want to save some money.
>
> >2. Is it true that multicore processors will not help much in this
> >situation?
>
> Not true. In your setup with two nics with same load you can easily use
> two cores. You can assign each nic to different core by the means of
> smp_affinity setting in /proc/irq/... or by using irqbalance daemon.
>
> >Best regards,
> >Derek
>
> pozdrawiam
> Marek Kierdelewicz
> KoBa ISP
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