> 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. Regards Anders -----Original Message----- From: wireshark-dev-boun...@wireshark.org [mailto:wireshark-dev-boun...@wireshark.org] On Behalf Of Martin Kaiser Sent: den 23 augusti 2013 10:36 To: wireshark-dev@wireshark.org 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 (a.bro...@bredband.net): > 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 <a.bro...@bredband.net>: >>> Guy Harris skrev 2013-08-22 18:16: >>>> On Aug 22, 2013, at 4:46 AM, Anders Broman >>>> <anders.bro...@ericsson.com> >>>> 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 <wireshark-dev@wireshark.org> >>>> Archives: http://www.wireshark.org/lists/wireshark-dev >>>> Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev >>>> mailto:wireshark-dev-requ...@wireshark.org?subject=unsubscribe >>> ___________________________________________________________________________ >>> Sent via: Wireshark-dev mailing list <wireshark-dev@wireshark.org> >>> Archives: http://www.wireshark.org/lists/wireshark-dev >>> Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev >>> >>> mailto:wireshark-dev-requ...@wireshark.org?subject=unsubscribe >> ___________________________________________________________________________ >> Sent via: Wireshark-dev mailing list <wireshark-dev@wireshark.org> >> Archives: http://www.wireshark.org/lists/wireshark-dev >> Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev >> >> mailto:wireshark-dev-requ...@wireshark.org?subject=unsubscribe > ___________________________________________________________________________ > Sent via: Wireshark-dev mailing list <wireshark-dev@wireshark.org> > Archives: http://www.wireshark.org/lists/wireshark-dev > Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev > > mailto:wireshark-dev-requ...@wireshark.org?subject=unsubscribe ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev@wireshark.org> Archives: http://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-requ...@wireshark.org?subject=unsubscribe ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev@wireshark.org> Archives: http://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-requ...@wireshark.org?subject=unsubscribe
