Fedora 29 (and 28) very slow

[Ron Sigal]

I'm having a strange experience upgrading Fedora. I was running Fedora 24, and I
upgraded to Fedora 29, one release at a time. After upgrading, I found that the Resteasy
testsuite, which normally runs in about 15 minutes, now takes about 45 minutes. A
colleague suggested I do a clean install, which I did, but there was no improvement. The
testsuite runs in about 15 on my backup laptop with Fedora 28, so I did a clean install of
Fedora 28, but, again, there was no improvement.

I'm just bewildered. Does anyone have any suggestions?

[Samuel Sieb]

On 11/26/18 2:45 PM, Ron Sigal wrote:
>  I'm having a strange experience upgrading Fedora. I was running
> Fedora 24, and I upgraded to Fedora 29, one release at a time. After upgrading, I found
> that the Resteasy testsuite, which normally runs in about 15 minutes, now takes about 45
> minutes. A colleague suggested I do a clean install, which I did, but there was no
> improvement. The testsuite runs in about 15 on my backup laptop with Fedora 28, so I did a
> clean install of Fedora 28, but, again, there was no improvement. 
 From the description, it appears to be a network intensive test.  Does 
it run everything locally on the machine it is run on?  Are there 
multiple parts to the test?  Can you tell which part of the test is slow?

[Tom Horsley]

On Mon, 26 Nov 2018 22:45:48 -0000
Ron Sigal wrote:

>  I'm just bewildered. Does anyone have any suggestions? 
Spectre and Meltdown kernel changes are reputed to slow
things down, but I don't know if it would be that much.

[Ron Sigal]

Hmmm. 
https://www.theregister.co.uk/2018/01/09/meltdown_spectre_slowdown/ says 
"Red Hat has clocked the patch performance impact as ranging from one to 
20 per cent <https://access.redhat.com/articles/3307751>."

-Ron

On 11/26/18 6:04 PM, Tom Horsley wrote:
>  On Mon, 26 Nov 2018 22:45:48 -0000
>  Ron Sigal wrote:
>
> > I'm just bewildered. Does anyone have any suggestions?
>  Spectre and Meltdown kernel changes are reputed to slow
>  things down, but I don't know if it would be that much. 
-- 
My company's smarter than your company (unless you work for Red Hat)

>  On Mon, 26 Nov 2018 22:45:48 -0000
>  Ron Sigal wrote:
>
> > I'm just bewildered. Does anyone have any suggestions?
>
>  Spectre and Meltdown kernel changes are reputed to slow
>  things down, but I don't know if it would be that much. 
They have removed some of the Spectre and Meltdown patches from the
upstream kernel because of the major performance hit. How current is the
current Fedora 28 & 29 kernels? Does a kernel from Rawhide fix the
problem?

perl -pe 's/^\s+//g' *.py

[Ron Sigal]

Well, I downloaded both Fedora 28 and 29 a couple of weeks ago ...

On 11/26/18 6:14 PM, alan(a)clueserver.org wrote:
> > On Mon, 26 Nov 2018 22:45:48 -0000
> > Ron Sigal wrote:
> >
> >> I'm just bewildered. Does anyone have any suggestions?
> > Spectre and Meltdown kernel changes are reputed to slow
> > things down, but I don't know if it would be that much.
>  They have removed some of the Spectre and Meltdown patches from the
>  upstream kernel because of the major performance hit. How current is the
>  current Fedora 28 & 29 kernels? Does a kernel from Rawhide fix the
>  problem?
>
>  perl -pe 's/^\s+//g' *.py
>  
-- 
My company's smarter than your company (unless you work for Red Hat)

[Rick Stevens]

On 11/26/18 3:32 PM, Ron Sigal wrote:
>  Well, I downloaded both Fedora 28 and 29 a couple of weeks ago ...
>  
Uhm, not the point. Do a "uname -r" on the fast F28 machine and the same
on the slow F28 and F29 machines. It may be that the fast F28 machine is
running an older kernel that doesn't have the Spectre or Meltdown
patches.

>  
>  On 11/26/18 6:14 PM, alan(a)clueserver.org wrote:
> >> On Mon, 26 Nov 2018 22:45:48 -0000
> >> Ron Sigal wrote:
> >>
> >>> I'm just bewildered. Does anyone have any suggestions?
> >> Spectre and Meltdown kernel changes are reputed to slow
> >> things down, but I don't know if it would be that much.
> > They have removed some of the Spectre and Meltdown patches from the
> > upstream kernel because of the major performance hit. How current is the
> > current Fedora 28 & 29 kernels? Does a kernel from Rawhide fix the
> > problem?
> >
> > perl -pe 's/^\s+//g' *.py
> >----------------------------------------------------------------------
>  
- Rick Stevens, Systems Engineer, AllDigital    ricks(a)alldigital.com -
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