Re: [PATCH 0/5] Assorted mvneta fixes

Hi Arnaud,

On Mon, Jan 13, 2014 at 11:36:05PM +0100, Arnaud Ebalard wrote:

Hi,

Willy Tarreau [off-list ref] writes:

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Funny enough, I spent some time this week-end trying to find the root
cause of some kernel freezes and panics appearing randomly after some GB
read on a ReadyNAS 102 configured as a NFS server. 

I tested your fixes and performance series together on top of current
3.13.0-rc7 and I am now unable to reproduce the freeze and panics after
having read more than the 300GB of traffic from the NAS: following
bandwith with a bwm-ng shows the rate is also far more stable than w/
previous driver logic (55MB/sec). So, FWIW:

Tested-by: Arnaud Ebalard <redacted>

Thanks for this.

BTW, the "performance" series is not supposed to fix anything, 

I was lazy and wanted to give the whole set a try in a single pass.

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and still it seems difficult to me to find what patch might have fixed
your problem. Maybe the timer used in place of an IRQ has an even
worse effect than what we could imagine ?

I guess so.

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Willy, I can extend the test to RN2120 if you think it is useful to also
do additional tests on a dual-core armada XP.

It's up to you. These patches have run extensively on my Mirabox (Armada370),
OpenBlocks AX3 (ArmadaXP dual core) and the XP-GP board (ArmadaXP quad core),
and fixed the stability issues and performance issues I was facing there. But
you may be interested in testing them with your workloads (none of my boxes
is used as an NFS server, NAS or whatever, they mainly see HTTP and very small
packets used in stress tests).

Well, I spent the evening on my RN104 (Aramda370 w/ 2 GbE ifaces) and my
RN2120 (Dual core ArmadaXP w/ 2GbE ifaces) using one as a router and
serving NFS traffic from the other (and then changing roles). I passed
hundreds of GB of TCP/NFS traffic and did not see any issue.

Additionally, FWIW, testing both using netperf show they easily support
routing traffic w/ line rate perf.

Regarding the patches, the problem they solve impacts all Armada boards
(370 and XP) which are used for network tasks. I think it would be nice
to have those backported to stable. I can commit to do the tests of the
backports both on XP and 370 hardware down to 3.12 or 3.11 kernel if it
can help. 

I think so. I've been successfully using them from 3.10 and upwards.

Cheers,
Willy