Re: Apple Link Aggrigation Band width
Re: Apple Link Aggrigation Band width
On Tue, Nov 28, 2006 at 09:43:35PM +0530, Anees Alappat wrote:
> Hi,
> I am using one Apple Power G5 machines with MAC OS X 10.4
> and one Intel pro with MAC OS X 10.4,each with two, 1Gbps network cards. I
> tried apple's Link Aggregation for creating a new virtual interface bond0.
> These machines are connected using 2 cross cables(CAT 6). But when i send a
> 50 GB data (single file) across the machines using ftp, i didnot find any
> impovement in speed than sending across a single network interface.
> One thing i observerd is that the data rate is not going above 53MB/s.This
> is less than half of the capacity of a single network interface.And the cpu
> usage is less than 10%,memory is utilizing fully(1GB). I feel the meaning of
> link aggregation comes only when data pumbing from stack is more than
> ~120MB?(ie, more than a single links capacity).
> I would like to know, how can we increase data pumbing from stack to
> layer2.Is there any bench marking application available for demonstrating
> link aggregation?
> It would be really helpful ,if any one share their views on Link
> aggreagation.
While I have no experience with Apple's implementation, many
implementations, like Cisco Etherchannel, IBM's Etherchannel in
AIX and IEEE 802.3ad all normally distribute packets based on the
last byte on the destination IP address or MAC address (for non-IP
traffic), or source/destination IP port number. What this means is
that a single TCP stream will only ever use one adapter. You only
get the bandwidth gains when streaming multiple IP streams. I've
seen an AIX box with 4 Etherchannelled gigabit ethernet adapters
pushing 320+ megabytes/sec, with a whole bunch of streams.
But, like others have said, I think you're hitting a disk
bottleneck. Try one of the ttcp programs or iperf.
FYI, see:
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.commadmn/doc/commadmndita/etherchannel_intro.htm
http://www.netcordia.com/tools/tools-ttcp.shtml
http://dast.nlanr.net/Projects/Iperf/
Cheers,
--
Paul Ripke
Unix/OpenVMS/TSM/DBA
I love deadlines. I like the whooshing sound they make as they fly by.
-- Douglas Adams
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