On 11/2/05, Steve Snyder <[email protected]> wrote:
> Hello.
>
> I am working on what amounts to a Ethernet to Ultra-Wide Band (UWB)
> converter box. Packets are simply routed from 1 interface to
> another.
>
> This box is based on an ARM7TDMI CPU, running Linux 2.4.26, and the
> network throughput of the box is CPU-limited. How limited? The
> 100Mbps/FD Ethernet can do no better than 35Mbps.
>
> I've discovered that I can improve Ethernet throughput by about %20 by
> removing the the conntrack/masq support from the kernel. The removal
> is good only as a test, though, since I need this functionality to
> move the packets between interfaces.
>
> This is the relevant config:
>
> CONFIG_IP_NF_CONNTRACK=y
> CONFIG_IP_NF_IPTABLES=y
> CONFIG_IP_NF_NAT=y
> CONFIG_IP_NF_NAT_NEEDED=y
> CONFIG_IP_NF_TARGET_MASQUERADE=y
>
> Enabled at boot time like this:
>
> /sbin/iptables -t nat -A POSTROUTING -o uwb0 -j MASQUERADE
> echo "1" > /proc/sys/net/ipv4/ip_forward
>
> I wonder if I can improve conntrack/masq performance at the expense of
> flexibility. This will be a closed system, with simple and static
> routing. Are there any trade-offs I can make to sacrifice unneeded
> flexibility in routing for reduced CPU utilization in conntrack/masq?
Hmmm... totally untested and don't know the details of UWB but...
can't you simply ether-bridge the interfaces instead of masquerading?
It should need less CPU
> Thanks.
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
--
Greetz, Antonio Vargas aka winden of network
http://wind.codepixel.com/
[email protected]
[email protected]
Every day, every year
you have to work
you have to study
you have to scene.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
