Hi Ed, thanks for your quick response. I'll reply inline.
On 06 Sep 2013, at 4:10 PM, Ed Cashin <ecas...@coraid.com> 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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