On 2018-03-13 10:17 AM, Carlo Pisani wrote:
hi
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
these tests were performed with
dd if=/dev/zero of=here bs=1k count=100000
I tried the above and see more or less the same effect on systems with
and without long calls.
You didn't say whether your config was 32 or 64 bits. I would have
thought long calls might be
more efficient on 64-bit kernels. I'm surprised that they have this
much effect on I/O performance.
Most of my testing is done on 64-bit kernels without long calls.
My c3750 seems stable with long calls:
dave@hiauly6:~$ uname -a
Linux hiauly6 4.15.0-1-parisc64-smp #1 SMP Debian 4.15.4-1 (2018-02-18)
parisc64 GNU/Linux
I'm not sure your stability issue is related to long calls. On c8000, I
have the driver for the video
card disabled because enabling DRM seems to cause stability issues. This
seems to be some sort
of PCI issue.
Dave
--
John David Anglin dave.anglin@xxxxxxxx
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