Hi Florin and Dave, I’m curious what problems were observed with the LD_PRELOAD mechanism. Were there performance issues? Or was it too difficult to try and cover different usage of POSIX calls? Or something else?
Thanks! -Matt > On Jul 30, 2018, at 10:39 AM, Florin Coras <fcoras.li...@gmail.com> wrote: > > Prashant, > > Dave is exactly right. If you still want to try out the LDP layer, I wouldn’t > set a global LD_PRELOAD variable because that will end up preloading all the > applications and, inevitably, to some unsupported usage patterns and crashes. > Instead, start only your app with LD_PRELOAD set, something like: > > LD_PRELOAD=../vpp/build-root/install-vpp_debug-native/vpp/lib64/libvcl_ldpreload.so > <your_app> > > Note that we’re exercising both the vcl and ldp layers with our test > infrastructure. So, you may also want to take a look at test_vcl for more > details on how we use the ldp layer. > > Hope this helps, > Florin > > >> On Jul 30, 2018, at 8:09 AM, Dave Wallace <dwallac...@gmail.com >> <mailto:dwallac...@gmail.com>> wrote: >> >> Prashant, >> >> The VCL LD_PRELOAD library is experimental and only works with a very >> limited set of legacy POSIX sockets applications (and only with single >> workers). >> >> The conclusion based on the results of the initial experimentation with >> LD_PRELOAD is that it is not a viable mechanism for accelerating legacy >> POSIX sockets based applications using the VPP host stack. The current >> recommendation is to refactor legacy applications to use the VCL API >> directly. >> >> You should also be aware that the VCL infrastructure is in the middle of >> being refactored at this time and thus the VCL API may change. I'll let >> Florin, who is doing the refactoring, add his input on the VCL API roadmap. >> >> Thanks, >> -daw- >> >> On 7/30/2018 7:21 AM, Prashant Upadhyaya wrote: >>> Hi, >>> >>> I have compiled VPP and it's running. I have an interface up and can >>> ping the IP applied there. >>> >>> Now I am trying to bring up a legacy application TCP server (the one >>> which uses POSIX calls). So I set the LD_PRELOAD to point to >>> .../vpp/build-root/install-vpp_debug-native/vpp/lib64/libvcl_ldpreload.so >>> But the server application now crashes on startup. >>> Even the ldd command starts crashing. >>> >>> Can somebody point me to the correct set of steps to be used for >>> LD_PRELOAD to bring up my legacy tcp server which will then engage the >>> VPP TCP stack instead of the kernel's >>> >>> Regards >>> -Prashant >>> >>> >>> -=-=-=-=-=-=-=-=-=-=-=- >>> Links: You receive all messages sent to this group. >>> >>> View/Reply Online (#9971): https://lists.fd.io/g/vpp-dev/message/9971 >>> <https://lists.fd.io/g/vpp-dev/message/9971> >>> Mute This Topic: https://lists.fd.io/mt/23858819/675079 >>> <https://lists.fd.io/mt/23858819/675079> >>> Group Owner: vpp-dev+ow...@lists.fd.io <mailto:vpp-dev+ow...@lists.fd.io> >>> Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub >>> <https://lists.fd.io/g/vpp-dev/unsub> [dwallac...@gmail.com >>> <mailto:dwallac...@gmail.com>] >>> -=-=-=-=-=-=-=-=-=-=-=- >> >> -=-=-=-=-=-=-=-=-=-=-=- >> Links: You receive all messages sent to this group. >> >> View/Reply Online (#9973): https://lists.fd.io/g/vpp-dev/message/9973 >> <https://lists.fd.io/g/vpp-dev/message/9973> >> Mute This Topic: https://lists.fd.io/mt/23858819/675152 >> <https://lists.fd.io/mt/23858819/675152> >> Group Owner: vpp-dev+ow...@lists.fd.io <mailto:vpp-dev+ow...@lists.fd.io> >> Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub >> <https://lists.fd.io/g/vpp-dev/unsub> [fcoras.li...@gmail.com >> <mailto:fcoras.li...@gmail.com>] >> -=-=-=-=-=-=-=-=-=-=-=- > > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > > View/Reply Online (#9974): https://lists.fd.io/g/vpp-dev/message/9974 > Mute This Topic: https://lists.fd.io/mt/23858819/675725 > Group Owner: vpp-dev+ow...@lists.fd.io > Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [mgsm...@netgate.com] > -=-=-=-=-=-=-=-=-=-=-=-
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