I've just tried rerunning some benchmarks on my panda, which I
reinstalled recently and am getting
some odd behaviour:
The kernel is 3.0.0-1404-linaro-lt-omap
For example:
simple_strlen: ,102400, loops of ,62, bytes=6.054688 MB, transferred
in ,20324707.000000 ns, giving, 297.897898 MB/s
simple_strlen: ,102400, loops of ,32, bytes=3.125000 MB, transferred
in ,7904053.000000 ns, giving, 395.366782 MB/s
simple_strlen: ,102400, loops of ,16, bytes=1.562500 MB, transferred
in ,7354736.000000 ns, giving, 212.448142 MB/s
simple_strlen: ,102400, loops of ,8, bytes=0.781250 MB, transferred in
,91553.000000 ns, giving, 8533.308575 MB/s
simple_strlen: ,102400, loops of ,4, bytes=0.390625 MB, transferred in
,1495361.000000 ns, giving, 261.224547 MB/s
simple_strlen: ,102400, loops of ,2, bytes=0.195312 MB, transferred in
,1983643.000000 ns, giving, 98.461518 MB/s
Note the 8 byte one apparently 40 times faster, and for true oddness:
smarter_strlen_ldrd: ,102400, loops of ,62, bytes=6.054688 MB,
transferred in ,3936768.000000 ns, giving, 1537.984331 MB/s
smarter_strlen_ldrd: ,102400, loops of ,32, bytes=3.125000 MB,
transferred in ,0.000000 ns, giving, inf MB/s
smarter_strlen_ldrd: ,102400, loops of ,16, bytes=1.562500 MB,
transferred in ,4180909.000000 ns, giving, 373.722557 MB/s
Now, while I like infinite transfer rates, I suspect they're wrong.
Anyone else seeing this?
Dave
Implementing estimating register pressure in SMS.
Experimenting with the implementation on libav microbench.
Discussed with Richard some issue raised while implementing.
== GDB ==
* Created and published Linaro GDB 7.3-2011.10 release.
* Fixed LP #871901 (Linaro GDB crashes on 3.x kernels) in
mainline and Linaro GDB 7.3.
* Backported mainline fix for LP #829595 (Separate debuginfo
misidentified with "remote:" access) to Linaro GDB 7.3.
* Completed blueprint "GDB as a cross-debugger".
* Worked on support for cross-platform core file generation.
== GCC ==
* Patch review week.
Mit freundlichen Gruessen / Best Regards
Ulrich Weigand
--
Dr. Ulrich Weigand | Phone: +49-7031/16-3727
STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E.
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk
Wittkopp
Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht
Stuttgart, HRB 243294
== 64 bit atomics ==
* Thanks to Ramana for OKing my gcc patches; and Richard for
committing them - I've backported these to the gcc-linaro branch
and pushed it - hopefully those will pass OK!
== String routines ==
* Sent my memchr patch to upstream newlib, received comments,
tweeked, and resent
* Sent strlen patch to upstream newlib
* Spent some time getting confused by timing issues on our Panda; it
got reinstalled with 11.09 a few
weeks ago and is now showing some odd behaviours. In particular I'm
seeing some tests show completion in 0ns
(and my code isn't -that- fast!), and others where the times vary
wildly - it's almost as if a timer interrupt is delayed
or missing; my same test binary works fine on one of Michael's Ursa's
running an older install.
== QEMU ==
* Tested Peters QEMU image for release
== Other ==
* Spent an afternoon reading through the System trace docs
On holiday next week; I'll poll email occasionally.
Dave
Hi,
* working through my inbox after being away
* a former patch of mine accidentally broke remote unwinding on IA64
* maintainer made a quick fix that made things worse for ARM
* posted a patch that aims to fix things up for all archs
* identified and submitted libunwind-android patches that could go upstream
* sent patch that lets another testcase pass on ARM Linux
* tried to help people on the mailing list with various issues
Regards
Ken
RAG:
Red:
Amber:
Green:
Current Milestones:
|| || Planned || Estimate || Actual ||
||add-omap3-networking || 2011-10-13 || 2011-10-13 || 2011-10-13 ||
||a15-systemmode-planning || 2011-10-13 || 2011-10-13 || 2011-09-22 ||
||a15-usermode-support || 2011-11-10 || 2011-11-10 || ||
||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || ||
Historical Milestones:
||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 ||
||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a ||
||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 ||
||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 ||
||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 ||
||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 ||
||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 ||
||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || 2011-09-15 ||
== add-omap3-networking ==
* patches pushed into qemu-linaro and final testing done
== a15-usermode-support ==
* this is now in qemu-linaro 2011.10; only remaining thing is
for the patches to be taken upstream (no major review issues)
== linaro-qemu-11.11 ==
* qemu-linaro 2011.10 released
== other ==
* completed a desk move
* some sw/hw archaeology to answer a question about the FIFO size of
the PL041 on ARM devboards as part of reviewing audio support patch
* trying to track down a really weird problem where qemu on ARM host
dies with apparent memory corruption
* Working on using pdebuildcross/multistrap when cross compiling Firefox.
With multistrap all dependencies should be sorted out automatically.
The current status is that pdebuild-cross for armel is set up and the
compilation of the Firefox package starts. Does not come all the way though,
because some dependencies (for X11) are not in place after all. Will
continue investigation.
Best Regards
Åsa
The Linaro Toolchain Working Group is pleased to announce the
release of Linaro QEMU 2011.10.
Linaro QEMU 2011.10 is the latest monthly release of
qemu-linaro. Based off upstream (trunk) QEMU, it includes a
number of ARM-focused bug fixes and enhancements.
New in this month's release:
- Instructions introduced with the Cortex-A15 (ARM mode
SDIV and UDIV, and the VFPv4 fused multiply-accumulate
instructions VFMA, VFMS, VFNMA, VFNMS) are now supported
in linux-user mode
- Beagle models now support USB networking (run the model with
"-usb -device usb-net,netdev=mynet -netdev user,id=mynet")
Known issues:
- There may be some problems with running multithreaded programs in
linux-user mode (LP:823902)
The source tarball is available at:
https://launchpad.net/qemu-linaro/+milestone/2011.10
Binary builds of this qemu-linaro release are being prepared and
will be available shortly for users of Ubuntu. Packages will be in
the linaro-maintainers tools ppa:
https://launchpad.net/~linaro-maintainers/+archive/tools/
More information on Linaro QEMU is available at:
https://launchpad.net/qemu-linaro
The Linaro Toolchain Working Group is pleased to announce the 2011.10
release of both Linaro GCC 4.6 and Linaro GCC 4.5.
Linaro GCC 4.6 2011.10 is the eighth release in the 4.6 series. Based
off the latest GCC 4.6.1+svn179483, it contains a range of vectoriser
performance improvements and general bug fixes.
Interesting changes include:
* Updates to 4.6.1+svn179483
* Vectorises more straight-line code with data dependencies
* Now picks the best vector width when vectorising straight line code
* Better handles handling auto increment addresses in SMS
* Changes the default vector width from double word to quad word
* Better handling extracting the top or bottom half of a quad word vector
* Now supports the NEON absolute difference instruction
Fixes:
* LP: #689887 ICE in get_arm_condition_code
* LP: #809761 oss4 version 4.2-build2004-1ubuntu1 failed to build on armel
Linaro GCC 4.5 2011.10 is the fifteenth release in the 4.5
series. Based off the latest GCC 4.5.3+svn179438, this is a
maintenance focused release.
Interesting changes in 4.5 include:
* Updates to 4.5.3+svn179438
Fixes:
* LP: #689887 ICE in get_arm_condition_code
The source tarballs are available from:
https://launchpad.net/gcc-linaro/+milestone/4.6-2011.10https://launchpad.net/gcc-linaro/+milestone/4.5-2011.10
Downloads are available from the Linaro GCC page on Launchpad:
https://launchpad.net/gcc-linaro
More information on the features and issues are available from the
release page:
https://launchpad.net/gcc-linaro/4.6/4.6-2011.10https://launchpad.net/gcc-linaro/4.5/4.5-2011.10
Mailing list: http://lists.linaro.org/mailman/listinfo/linaro-toolchain
Bugs: https://bugs.launchpad.net/gcc-linaro/
Questions? https://ask.linaro.org/
Interested in commercial support? inquire at support(a)linaro.org
-- Michael
