Hi Ed, thanks for your quick response. I'll reply inline.
On 06 Sep 2013, at 4:10 PM, Ed Cashin <ecashin@xxxxxxxxxx> wrote:
>> * Jumbo frames (9000) configured and working on target, initiator and Dell PowerConnect 8132 switch (with hardware flow control enabled).
>
> There's an "aoe-sancheck" tool in the aoetools that you can use just to double check network things. But if you haven't tried it already, using a direct connection for comparison is a good sanity check.
I tried a direct connection but there was no difference. I can however ping with jumbo frames and a dump of AoE traffic shows that it's using 8740-byte packets, so things are looking good at the network layer. Sadly aoe-sancheck doesn't seem to be working for me:
# aoe-sancheck
Probing...done.
==========================================
INTERFACE SUMMARY
==========================================
Name Status MTU PCI ID
==========================================
DEVICE SUMMARY
==========================================
Device Macs Payload Local Interfaces
But aoe-stat gives:
e0.0 55971.971GB xgb1 8704 up
e0.1 4.294GB xgb1 8704 up
so at least it chose a decent payload size.
> By the way, are you using the v81 driver that's inside of the 3.10.7 kernel? If so, how did you know to use the aoetools v36? I sometimes worry that people won't find it when they notice aoe in the /lib/modules. (The driver at coraid.com comes bundled with the aoetools.)
I'm using the in-kernel driver, yes. I knew to install aoetools based on a couple of AoE howtos (including Coraid's Linux support howto). I'm using Gentoo so I just installed the latest available versions of aoetools and vblade. I know people have complained about distro support for AoE but Gentoo seems to have done quite well there.
> I don't have a lot of experience with the other non-Coraid AoE targets that are out there, but you might check whether one of them that's oriented more toward performance could be useful to you.
I've avoided kvblade, ggaoed and qaoed because they all look to be unmaintained for years, but I'll give them a try.
> That said, while checking the vblade README for the design goals, I noticed that it advertises a capacity for 16 outstanding commands. If you want to try some tuning, you could adjust Bufcount in dat.h and then make sure your settings in /proc are sufficient to allow the kernel to buffer 16 writes. (Read commands are small.)
I'll try that, thanks.
Derick
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