Hi All,
2017-02-09 11:34 GMT+01:00 Bálint Réczey <balint@xxxxxxxxxxxxxxx>:
> Hi Guy,
>
> 2017-02-08 19:51 GMT+01:00 Guy Harris <guy@xxxxxxxxxxxx>:
>> On Feb 8, 2017, at 5:40 AM, Peter Wu <peter@xxxxxxxxxxxxx> wrote:
>>
>>> I did not expect Libgcrypt to consume entropy when it is just doing
>>> decryption.
>>
>> I'm concerned with consuming CPU and wall-clock time - i.e., slowing *shark startup - not entropy.
>
> perf would show that.
>
> rbalint@chaos:~/Downloads$ cat exit.lua
> os.exit(1)
> rbalint@chaos:~/Downloads$ wireshark -X lua_script:exit.lua
> rbalint@chaos:~/Downloads$ perf record -g -- wireshark -X lua_script:exit.lua
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.249 MB perf.data (~10883 samples) ]
> rbalint@chaos:~/Downloads$ perf report --sort comm,dso
> + 58.47% 0.00% wireshark [unknown]
> + 34.86% 15.55% wireshark libQt5Gui.so.5.3.2
> + 21.56% 20.78% wireshark libQt5Widgets.so.5.3.2
> + 11.88% 8.99% wireshark libc-2.19.so
> + 9.50% 9.42% wireshark libglib-2.0.so.0.4800.0
> + 8.90% 7.35% wireshark libwireshark.so.8.1.2
> + 8.75% 8.75% wireshark [kernel.kallsyms]
> + 8.06% 7.51% wireshark libQt5Core.so.5.3.2
> + 7.12% 3.97% wireshark ld-2.19.so
> + 5.45% 5.45% wireshark libfontconfig.so.1.8.0
> + 5.33% 5.33% wireshark libz.so.1.2.8
> + 1.75% 1.75% wireshark libpng12.so.0.50.0
> + 1.29% 1.29% QThread [kernel.kallsyms]
> + 1.15% 1.13% wireshark i965_dri.so
> + 0.82% 0.13% wireshark wireshark
> + 0.50% 0.50% wireshark libfreetype.so.6.11.1
> + 0.46% 0.15% wireshark libX11.so.6.3.0
> + 0.40% 0.40% wireshark libharfbuzz.so.0.935.0
> + 0.30% 0.30% wireshark libexpat.so.1.6.0
> + 0.28% 0.00% wireshark libnl-genl-3.so.200.19.0
> + 0.28% 0.16% wireshark libqxcb.so
> + 0.20% 0.20% wireshark libnettle.so.4.7
> + 0.16% 0.00% QXcbEventReader [unknown]
> + 0.16% 0.16% QXcbEventReader [kernel.kallsyms]
> + 0.16% 0.03% QXcbEventReader libpthread-2.19.so
> + 0.16% 0.16% wireshark liblua5.2.so.0.0.0
> + 0.15% 0.00% wireshark libdl-2.19.so
> + 0.15% 0.08% wireshark libpthread-2.19.so
>
> I don't see anything related to that.
Seeing the Qt libs made me curious and ran another test on Debian
Jessie with packaged 2.2.2 :
rbalint@chaos:~/Downloads$ time wireshark-gtk -X lua_script:exit.lua
real 0m0.304s
user 0m0.244s
sys 0m0.044s
rbalint@chaos:~/Downloads$ time wireshark -X lua_script:exit.lua
real 0m0.906s
user 0m0.556s
sys 0m0.128s
Cheers,
Balint
