2013/8/23 Anders Broman <[email protected]>: >> before we change it, should we remember the previous setting and restore it >> when dumpcap exits? > > Preferably yes but I'm not sure it's possible as I think root privileges are > required to write to the file and I think dumpcap > Drops those after starting to capture. And in the configuration the documentation recommends dumpcap does not run as root, it has permission to capture only.
Cheers, Balint > > Regards > Anders > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Martin Kaiser > Sent: den 23 augusti 2013 10:36 > To: [email protected] > Subject: Re: [Wireshark-dev] Enabling linux kernel jit compiler from dumpcap? > > before we change it, should we remember the previous setting and restore it > when dumpcap exits? > > Thus wrote Anders Broman ([email protected]): > >> Bálint Réczey skrev 2013-08-22 23:02: >>> Hi, > >>> I would be happier if the applications I run did not change kernel >>> configuration without my consent. >> I see your point... > >>> Regarding Wireshark I would prefer suggesting "echo 1 > >>> /proc/sys/net/core/bpf_jit_enable" in the documentation instead of >>> adding code to enable JIT. >>> There may be good reasons for not enabling it by default in the Linux >>> kernel. >> The problematic thing is that people seldom reads the documentation, >> the setting gets reset at a reboot and it's easy to forget to >> re-enable it. The ideal thing would be if dumpcap >> - Had a preference/command line flag whether to use JIT or not. >> - If told to use it check if it was enabled or not used JIT and put it >> back to zero if not set when starting. >> Wireshark could then default to use JIT and some warnings could be >> displayed in the welcome screen and in dumpcaps help output. > >> netsniff-ng activates it by default it seems. >> Regards >> Anders > >>> Cheers, >>> Balint > >>> 2013/8/22 Anders Broman <[email protected]>: >>>> Guy Harris skrev 2013-08-22 18:16: > >>>>> On Aug 22, 2013, at 4:46 AM, Anders Broman >>>>> <[email protected]> >>>>> wrote: > >>>>>> Should we add code to enable the JIT compiler from dumpcap? >>>>> Should I add code to enable the JIT compiler to libpcap while I'm at it? > >>>>> Should the Linux kernel folks enable it by default? > >>>>> I'm inclined to answer "yes" to all three questions. I think the >>>>> FreeBSD JIT compiler is enabled by default. I'm surprised that the Linux >>>>> one isn't. >>>> I checked in the dumpcap code. I agree that it might be useful in >>>> libpcap too, root privileges are required to change it I think. and >>>> Yes > >>>>> I'm surprised that the Linux one isn't >>>> Regards >>>> Anders > >>>>> ___________________________________________________________________________ >>>>> Sent via: Wireshark-dev mailing list <[email protected]> >>>>> Archives: http://www.wireshark.org/lists/wireshark-dev >>>>> Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev > >>>>> mailto:[email protected]?subject=unsubscribe > >>>> ___________________________________________________________________________ >>>> Sent via: Wireshark-dev mailing list <[email protected]> >>>> Archives: http://www.wireshark.org/lists/wireshark-dev >>>> Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev >>>> >>>> mailto:[email protected]?subject=unsubscribe >>> ___________________________________________________________________________ >>> Sent via: Wireshark-dev mailing list <[email protected]> >>> Archives: http://www.wireshark.org/lists/wireshark-dev >>> Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev >>> >>> mailto:[email protected]?subject=unsubscribe > > >> ___________________________________________________________________________ >> Sent via: Wireshark-dev mailing list <[email protected]> >> Archives: http://www.wireshark.org/lists/wireshark-dev >> Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev >> >> mailto:[email protected]?subject=unsubscribe > ___________________________________________________________________________ > Sent via: Wireshark-dev mailing list <[email protected]> > Archives: http://www.wireshark.org/lists/wireshark-dev > Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev > mailto:[email protected]?subject=unsubscribe > ___________________________________________________________________________ > Sent via: Wireshark-dev mailing list <[email protected]> > Archives: http://www.wireshark.org/lists/wireshark-dev > Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev > mailto:[email protected]?subject=unsubscribe ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <[email protected]> Archives: http://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev mailto:[email protected]?subject=unsubscribe
