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I wanted to test Jumbo frames, just to make sure that both the switch and the
nics could support it. I understand that it would/should cut down the ratio
of #packets/second.

What I've done is set the MTU to 9000 via "ifconfig eth1 mtu 9000" on both
node1 and node2. Then if I try a ping it works..but if I do a
ping -s 9000 node2_eth1_ip it doesn't work.


It was my understanding that If I increased the MTU to 9000, I can transfer
larger packets ... and less # of transfers?

- -peter




Alexei_Roudnev wrote:
> I just used switch monitoring (bt snmpstat.sf.net) and it shows me average
> packet size and # of packets/second.
>
> Generally speaking, JOMBO is not your goal; goal is to keep #packets/second
> lower than 1,000 - 5,000/secopnd (20,000/second is a boundary when system
> began to spend sugnificant time on packet processing).
>
> You can use Linux statistics instead of switch statistics (I just have
> network monitoring for ALL switches in the system, so I could always use
> switch side).
>
>
> Back to your case. Do few tests:
> - (1) Use -x- cable, and test ping;
> - (2) switch from cable to the switch, and 'ping'.
>
> If (*1) work and (2) don't, blame switch. If (1) don't woprk, verify your
> system setting.
>
> I had not any problems with jumbo framnes on DELL's 16540 and 2850, and on
> Cisco and DELL switches.
>
> ----- Original Message -----
> From: "Peter Santos" <psantos@(protected)>
> To: <suse-oracle@(protected)>
> Sent: Monday, August 07, 2006 9:27 AM
> Subject: [suse-oracle] re: How to test the interconnect with jumbo frames
> and RAC
>
>
>
> Folks,
> I'm wondering if anyone knows the proper procedure for
> testing jumbo frame functionality with 10gR2 RAC on SuSe 9 En x86_64bit.
>
> In my small test environment of 2 nodes, both nodes have 2
>
>> nics(eth0,eth1).
>
> "eth1" on both nodes is configured for the interconnect. As far as I can
>
>> tell they
>
> can support GigE transfers... this is from dmesg.
>
> "e1000: eth1: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex"
>
> I also have a DellPowerConnect 2700 switch that support Jumbo Frames .. up
>
>> to
>
> 9000 bytes.
>
> When I do an "ifconfig eth1 mtu 9000" on both machines and restart the
>
>> cluster,
>
> the 2 nodes don't seem to talk via the interconnect.
>
> Is there a more appropriate way to set this up and how do I test it?
>
> TIA
> -peter

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