RE: 10-GigE for servers

[Matthew Huff <mhuff () ox com>]

It's also host dependent. The switch will hash based on the algorithms it supports, however it can be asymmetrical if 
the host doesn't support the same ones. Most host OS's don't hash outbound to the switch based on layer 4 or above. 
Most only hash at layer 2.

There are 10GE cards for most hardware and OS platforms. Getting them to run at a fraction of that speed depends on 
application and IP stack tuning. Even then, there are significant bottlenecks. That's one reason Infiniband for HPC has 
taken off.


----
Matthew Huff       | One Manhattanville Rd
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> -----Original Message-----
> From: Chris Adams [mailto:cmadams () hiwaay net]
> Sent: Friday, May 01, 2009 2:16 PM
> To: nanog () nanog org
> Subject: Re: 10-GigE for servers
>
> Once upon a time, Alex Thurlow <alex () blastro com> said:
> > As long as it's not a single connection that you're looking to get
> over
> > 1Gb, etherchannel should actually work.  It uses a hash based on (I
> > believe) source and destination IP and port, so it should roughly
> > balance connections between the servers.
>
> That depends on the devices on each end.  For example, some switches
> can
> only hash on MAC addresses, some can look at IPs, and some can look at
> ports.
>
> --
> Chris Adams <cmadams () hiwaay net>
> Systems and Network Administrator - HiWAAY Internet Services
> I don't speak for anybody but myself - that's enough trouble.