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Bug#820622: linux-image-4.5.0-trunk-armmp-lpae: raspberry pi 2: smsc95xx 1-1.1:1.0 eth0: kevent 2 may have been dropped



Control: tag -1 patch moreinfo

On Wed, 2016-04-13 at 11:43 -0700, Vagrant Cascadian wrote:
> On 2016-04-10, Vagrant Cascadian wrote:
> > 
> > On 2016-04-10, Ben Hutchings wrote:
> > > 
> > > On Sun, 2016-04-10 at 22:49 +0200, Diederik de Haas wrote:
> > > > 
> > > > At https://plugwash.raspbian.org/linux_3.18/ you can find the
> > > > things for the 
> > > > latest raspbian.org kernel.
> > > Thanks.  That has a patch to turn off the turbo_mode module
> > > parameter
> > > by default.
> > > 
> > > Vagrant, could you try putting "options smsc95xx turbo_mode=N" in
> > > /etc/modprobe.d/smsc95xx.conf ?
> > Added to one of the two machines, updated the initramfs (just in
> > case
> > the module gets loaded in initramfs), and rebooted ... will see if
> > that
> > works.
> > 
> > The other option I was pointed to was to update to the latest boot
> > firmware, though I haven't tried that yet:
> New boot firmware didn't help. Configuring the module to not use
> turbo_mode did.

Could you test with turbo_mode re-enabled and with this patch applied?

Also could you test network receive throughput (e.g. with netperf -t
TCP_STREAM, sending *to* the RPi) in these three different
configurations:

1. turbo_mode=0
2. turbo_mode=1, current driver
3. turbo_mode=1, patched driver

(Unfortunately netperf is non-free due to a slightly weird licence.
Also take care to remove it afterwards as the server allows a trivial
network DoS if you leave it running...)

Ben.

-- 
Ben Hutchings
All extremists should be taken out and shot.

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