On 11/26/2012 12:01 PM, Bruno Wolff III wrote:
On Mon, Nov 26, 2012 at 10:19:05 -0700,
JD <jd1008@xxxxxxxxx> wrote:
This is why I decided to download source of kernel 3.7.0-rc6.git from
fc19 and build it on my fc16, in the hopes of a better kernel. But
no.... it has the kswap bug eating 50% of cpu.
So was this happening with both 3.7 and 3.6 kernels? The wording above
suggests that it didn't happen until you tried a 3.7 kernel, but
originally you said it happened with a 3.6.6 kernel. If the problem
happens in 3.6 and is related to what is going on in 3.7 that info
might be relevant to solving the problem.
The 50% cpu consumption by kswapd appeared first in 3.7
The Read/Write failures started in 3.6.X kernels, but do not appear in 3.7.
3.7 is doing the right thing by first issuing a hard reset to the sleeping
drives before reading or committing the journals. 3.6.X was not sending any
hard resets to the sleeping drives.
I will be testing 3.6.7 to see if either of these issues is still present.
It is obvious that hardly any extensive testing goes into fedora
before release, in the attitude that the lab rats (us) will do that.
Has this been the culture of the fedora developers form the beginning?
For the kernel there is a lot of different hardware out in the wild,
so kernel developers may not see an issue affecting only some
hardware. That's why testing of development kernels is encouraged.
Lots of people do this this testing and since Fedora is pretty close
to upstream, Fedora benefits from this testing. Some of us Fedora
users also test the development kernels and provide feedback (as in
the kswapd case, module signing issues and other issues) before the
kernels get into stable updates or a release.
But Bruno, the "not sending a hard reset to sleeping drives" is in all
3.6.X kernels.
You would think they would have caught it rather than propagate it.
I can tell you it did lead to data loss for me. Some of it was important
to me.
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