[OpenWrt-Devel] Toolchain issue: Significant decrease in performance of binaries produced by Barrier Breaker relative to Attitude Adjustment
hauke at hauke-m.de
Sat Aug 30 12:51:00 EDT 2014
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On 08/30/2014 06:45 PM, Matthias Schiffer wrote:
> On 08/30/2014 06:42 PM, Matthias Schiffer wrote:
>> Hi, I've noticed that the code produced by Barrier Breaker's
>> toolchain sometimes has significantly worse performance that that
>> built by Attitude Adjustment.
>> I can see this extremely with the VPN tool "fastd" developed and
>> maintained by me: On the same Barrier Breaker system, a binary
>> built by the default Barrier Breaker toolchain (GCC 4.8-linaro)
>> gets about 35% less throughput than one built with Attitude
>> Adjustment (GCC 4.6-linaro). With the 4.6-linaro toolchain of
>> Barrier Breaker, I still get 20% worse performance than with the
>> 4.6-linaro of Attitude Adjustment.
>> Do you have any suggestions what I can do to solve or analyze the
>> issue? Any compiler flags I should try fiddling with? Optimizing
>> with -Os vs. -O3 doesn't seem to make a difference.
>> Thanks, Matthias
> I forgot to tell that this is on ar71xx.
This could be a problem caused by mips16. We use that in BB to create
smaller binaries. but Jonas saw a performance problem in some
applications, mostly stuff doing crypto (big integer calculations).
Can you try to build the BB toolchain without the mips16 feature in
target/linux/ar71xx/Makefile and try your application again.
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