Re: How to test NIC performance?

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On Sun, 2005-10-30 at 19:16 +1030, Tim wrote:
> Andy Pieters
> 
> >> Another thing you might want to check is how fast your dns server is 
> >> responding.  It is not unusual for "shady" providers to have quite a
> >> bit of lag on their dns servers. try pinging the ip address of one of
> >> the dns servers; look in /etc/resolv.conf for the addresses
> 
> Dan Hensley:
> 
> > Unfortunately my dns servers don't respond to ping.
> 
> Try the "dig" tool on a domain name.  It also reports the time taken.

I tested my nameservers, and the first time it took about 200 msec.
Subsequent times took about 60 msec.

> I'm wondering whether you'd benefit from running your own DNS server, if
> your ISP's were slow?  It is an advantage in my case, but you'd, first,
> need to determine whether this was the cause of your problems.

I honestly doubt that this is the problem.  I've never had to consider
it before, and I've been using Comcast with these nameservers for years.
The problem isn't connecting to sites or resolving their IP addresses.
Once I do connect to bzflag servers, it's the high variability in the
traffic to that server that is the problem.  And every single server,
including one on my local machine, is affected.

One potential issue is that bzflag uses UDP for its communication.  It
wouldn't surprise me if the forcedeth driver is focused on TCP.  But I
have no idea, and I'm still struggling to find a test that demonstrates
this.

I found the netio package with a Linux binary, and I used it to test my
machine.  Throughput seems fine, but I couldn't test UDP because the
port it was trying to use was already in use.  I haven't gone through
the source to try to fix this.  And it doesn't give me the benchmark I'm
looking for anyway.

I also thought I'd try using a more recent forcedeth driver than comes
with the FC4 kernel, but I have not been able to find where to get it.
And on top of that, the FC4 kernel build dumps errors very quickly.
It's been years since I have built a kernel from scratch, but I don't
remember it being particularly difficult.

Dan



> 
> -- 
> Don't send private replies to my address, the mailbox is ignored.
> I read messages from the public lists.
> 


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