Re: C3600 kernel/64bit 4.* slow IO due to -mlong-calls

[John David Anglin <dave.anglin@bell.net>]

On 2018-03-15 4:43 PM, Helge Deller wrote:
> On 15.03.2018 16:36, Carlo Pisani wrote:
> > I am experiencing a very annoying behavior with my HPPA C3600: if I
> > compile the (linux) kernel with  -mlong-calls then the IO (e.g. file
> > copy) becomes very slow, and the PCI becomes unstable (i.e. it crashes
> > the machine)
> >
> > kernel  gcc     binutils    with mlong    without mlong
> > 4.15.7  4.9.3   2.25.1     13.4 MB/s    27.0 MB/s
> > 4.15.7  6.4.0   2.25.1     13.4 MB/s    27.0 MB/s
> > 4.15.7  6.4.0   2.29.1     14.4 MB/s    25.0 MB/s
> Interesting bad results!
I don't believe the instability mentioned is due to long calls. It's the 
following issue:
https://www.spinics.net/lists/linux-parisc/msg01024.html

--
John David Anglin  dave.anglin@bell.net