Re: Channel bonding.
From: Dean Strik (dean_at_stack.nl)
Date: 04/22/05
- Previous message: Steven Hartland: "Re: Channel bonding."
- In reply to: Sean: "Channel bonding."
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Date: Fri, 22 Apr 2005 18:33:40 +0200 To: Sean <seancody@gmail.com>
Sean wrote:
> I've been experimenting with the idea of doing channel bonding as a
> means of improving the performance of some heavily used file servers.
> Currently I am using a single Intel 1000MT interface on each file
> server and it has rather lack luster performance.
>
> I've set two ports of my switch to 'shared' (an Extreme
> BlackDiamond 6800) and am using an Intel 1000MT Dual Port for
> the bonding interfaces.
>
> The performance increase with I see is marginally better than
> just the one interface (70MB/s [bonded] vs 60MB/s [single]) which
> is slightly disappointing. I am using ifstat and iostat (for disk
> throughput, 30MB/s on a 3ware 7500-12 yet again disappointing) to
> monitor and a variant of tcpblast to generate traffic. I'm using
> 4 other machines (on the same blade on the switch) to generate the
> traffice to the bonded interface all are similar hardware with
> varrying versions of FreeBSD. In order to get the numbers as high
> as I have I've enabled polling (some stability issues being
> used under SMP).
If I understand you correctly, you are not doing any load sharing from
the FreeBSD box to the BD6800, right?
Also, it's likely the BD6800 uses the lsb of the source-mac xor
dest-mac. If you have four clients only, a marginal increase in
performance could well be because the src^dst often returns the same
value (e.g. with 3 out of 4 clients having an even MAC, and 1 out of 4
an odd MAC). Try making this 50/50 by changing a MAC address of the
client using 'ifconfig ether'.
-- Dean C. Strik Eindhoven University of Technology dean@stack.nl | dean@ipnet6.org | http://www.ipnet6.org/ "This isn't right. This isn't even wrong." -- Wolfgang Pauli _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org"
- Previous message: Steven Hartland: "Re: Channel bonding."
- In reply to: Sean: "Channel bonding."
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