On 14-10-2015 19:06, Jim Wilson wrote: > On Tue, Oct 13, 2015 at 5:47 AM, Liu Ting <ting....@freescale.com> wrote: >> When upgrading meta-linaro/meta-linaro-toolchain from daisy to fido, we >> faced drastic performance downgrade (-34.06%) on linux ipv4 forwarding. The >> board is ls1021atwr (ARM Cortex-A7 MPCore compliant with ARMv7-A >> architecture). >> We did some investigation, and suspected that it is caused by the toolchain >> upgrade. Did someone meet similar issue? > > I haven't heard of any such issue, but that doesn't mean much, as I > don't read kernel mailing lists, and don't have full knowledge of all > gcc bugs that have been privately and publicly reported. Basically, > without a testcase, that we can use to reproduce the problem, you are > unlikely to get much useful info from a toolchain developer. And if > the testcase requires building a linux system from scratch, then that > may be too much trouble for us to follow up on. You might try asking > some linaro kernel developers about this if you haven't already. They > would know more about kernel performance issues.
Also if you could provide any annotate profile which outline some code generation issue it will help narrow down if this is really a toolchain issue. > > Jim > _______________________________________________ > linaro-toolchain mailing list > linaro-toolchain@lists.linaro.org > https://lists.linaro.org/mailman/listinfo/linaro-toolchain > _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org https://lists.linaro.org/mailman/listinfo/linaro-toolchain
