Re: performance information
On Tue, Nov 18, 2008 at 01:51:13PM +0000, Martin Guy wrote:
> I only get 3 MB/s on a 100Mbps network using a 200MHz ARM CPU
> because it runs out of CPU to run the TCP network stack.
> You can find out whether this is your problem by running "vmstat 5"
> on a console while you beat the network/disks to death, watching the
> "CPU - id" column. If it goes down to 0, that is your problem. The
> same may be true of disk access, especially if you are using RAID.
>
> Do you have any reason to think that *debian* is particularly slow on
> this box, or are you just surprised that everything doesn't run at the
> speed of the fastest hardware specs for every device?
I have managed to route packets between two 100Mbit interfaces using a
400MHz PXA255, and the throughput was 95Mbit. That was using PCI AMD
972 MACs (pcnet32). Of course those do DMA and lots of other lovely
things which help reduce CPU load.
--
Len Sorensen
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