Mailinglist Archive: opensuse-factory (498 mails)

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Re: [opensuse-factory] openSUSE Leap 42.2 Alpha1 released
  • From: Greg Freemyer <greg.freemyer@xxxxxxxxx>
  • Date: Tue, 24 May 2016 17:10:58 -0400
  • Message-id: <>
On Tue, May 24, 2016 at 3:35 PM, Richard Brown <RBrownCCB@xxxxxxxxxxxx> wrote:
On 24 May 2016 at 21:02, Greg Freemyer <greg.freemyer@xxxxxxxxx> wrote:
On Tue, May 24, 2016 at 10:44 AM, Ludwig Nussel <ludwig.nussel@xxxxxxx>
There are two exceptions though. The SLE12SP2 Beta1 sources landed
in OBS and we got Qt 5.6 and kernel 4.4 from there already.

Is there any chance that 42.2 will get a 4.6 or newer kernel?

The key feature for me is much better USB 3.1 support. USB 3.1 has
been around for a while now, so it seems like something that should be
better supported in Leap 42.2.

ps: I know 4.4 is a LTS kernel, I just don't when the next LTS kernel
may come along. Sometime this summer would not be a surprise:


Greg, please, no

I can live with a 4.4 kernel, but I do think USB 3.1 Gen 2 support is
very appropriate for Leap 42.2 which will be the main Leap distro for
most of 2017.

For starters, Kernel 4.4 has sufficient USB 3.1 support
Kernel 4.6 is adding USB 3.1 Gen 2 devices (aka SuperSpeedPlus)
USB 3.1 devices is not the same as Type-C or power delivery, both of
which are supported in Kernel 4.4


I have not yet seen any hardware that requires USB 3.1 Gen 2 support

"requires" I don't know about. But I bought my first USB 3.1 Gen 2
PCI card in Oct 2015.

I now have 4 of them. In my testing I am seeing greater than 500
MB/sec speeds with:

- Tumbleweed as of a month or so ago (kernel 4.5)
- a Type-C connection to a USB 3.1 Gen 2 sata docking station
- a highspeed Samsung SSD (over 560 MByte / sec spec)

With that combo I got 580 MB/sec speeds.

Would I get the performance increase with a 4.4 kernel? (I have no
idea as I haven't tested that).

Even with a 4.5 kernel my late April Tumbleweed testing did NOT show
proper reporting of the speed.

I looked in both dmesg and "lsusb -t"

I tested 2 different brands of USB 3.1 Gen 2 PCIexpress cards. My
assumption is that even with a 4.5 kernel, the drivers haven't yet
fully implemented SuperSpeedPlus reporting.

If anyone out there has it, then I consider them likely to be the kind
of cutting edge, technological enthusiast who would be better served
by Tumbleweed.

I am running a modern computer yes, but not because I want to
experiment. Stability and performance are both very important to me.
Especially USB performance. I routinely transfer 100s of GBs (or low
numbers of TBs) of data between USB devices.

As Yamaban has already said, Kernel 4.4 is the LTS release for 2016

We are releasing Leap 42.2 in 2016

Unfortunately for me that is a strong argument.

Furthermore, it's the Kernel which is going to be in SLE 12 SP2,
meaning we get SLE patches, which is a good thing

If you want a different kernel version, please realise that the Leap
release model (which means 42.1 will be supported for 6 months after
Leap 42.2's release, not 2 months like the old openSUSE model).

Well, the old model had 2 months where 3 kernels were supported. ie.
The kernels for 13.0, 13.1, and 13.2 were all supported for 2 months
immediately following 13.2's release.

I assume that for the 2 months immediately following 42.2's release
there will be 3 kernels supported as well: kernels for 13.2, 42.1,
and 42.2

Thus the situation for those 2 months is exactly the same as it has
been for many years.

The real change is 6 months after 42.2 is released. By that point
both 13.2 and 42.1 will be out of support, and there will be only one
openSUSE supported kernel (4.4 it seems).

This means our Kernel team is going to have to support 2 kernels for a
longer period of time than they ever had to before. That's a lot of
work for them (especially as Leap 42.1 already chose something other
than the SLE kernel)

Taking the SLE Kernel effectively nullifies that extra work, provides
a more stable foundation for Leap users, ensures Leap users are going
to get a kernel that is constantly patched and exceptionally well
maintained, and is still newer than the
4.1 Kernel which was 2015's LTS Kernel and is in Leap 42.1

It's the best option we have today, it's the best option we will have
over summer, and will be the best for users when we release Leap 42.2
in November.

Obviously I think that Leap should offer full USB 3.1 Gen 2 support
prior to 42.3's release roughly 18 months from now. That will be
fully 2 years after USB 3.1 Gen 2 devices became available.

How that is achieved is I don't know. Back ports to the 4.4 kernel?
Formal support of the early 2017 LTS kernel?

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