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Thread: Kernel 4.15RC (Release Candidate) series

  1. #11
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    Re: Kernel 4.15RC (Release Candidate) series

    4.15-rc5 do not work with my Nvidia GTX1070 on 18.04 Daily, it starts looping halfway through boot. But 4.14-13 works just fine.

    edit. I seem to recall now that it is normal, historically Nvidia usually doesn't start working until RC8 or so, don't know why but it is repeating itself each cycle
    Last edited by xeizoo; December 31st, 2017 at 12:05 PM.
    Ubuntu 18.04 Z87-A - 4790K@4.8GHz 16GB@2133MHz GTX1070 8GB Xonar Essence ST
    Windows 10/VMWare Ubuntu Maximus VIII Hero 6700K@4.7GHz 32GB@3200MHz GTX1080Ti@water UR22
    X: AOC Q2770PQU 1440P S-PLS

  2. #12
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    Re: Kernel 4.15RC (Release Candidate) series

    4.15-rc6 doesn't work with Nvidia too, same failure to compile kernel module for Nvidia. 4.14 works great, compiles the Nvidia module with no probs.

    It would be interesting to test 4.15 to see how much performance is lost with the new security patch for Intel, one would probably not want to flip it off since that would mean all internet is kinda insecure. Like it is right now with all kernels without the patch, there are no known exploit as of yet but they are likely to pop up soon. So, we need 4.15 rather quickly.
    Ubuntu 18.04 Z87-A - 4790K@4.8GHz 16GB@2133MHz GTX1070 8GB Xonar Essence ST
    Windows 10/VMWare Ubuntu Maximus VIII Hero 6700K@4.7GHz 32GB@3200MHz GTX1080Ti@water UR22
    X: AOC Q2770PQU 1440P S-PLS

  3. #13
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    Re: Kernel 4.15RC (Release Candidate) series

    Quote Originally Posted by xeizoo View Post
    It would be interesting to test 4.15 to see how much performance is lost with the new security patch for Intel, one would probably not want to flip it off since that would mean all internet is kinda insecure. Like it is right now with all kernels without the patch, there are no known exploit as of yet but they are likely to pop up soon. So, we need 4.15 rather quickly.
    Yes, actual performance drop information would be useful. I compiled a 4.15-rc6 kernel with the new kernel configuration parameter, PAGE_TABLE_ISOLATION, set and it didn't seem to make any difference (based only on one clean kernel compile time), around 25 minutes either way. See also here, which also didn't show a difference in kernel compile time, but did in other tests.

    EDIT: see also here
    Last edited by Doug S; January 4th, 2018 at 02:10 AM.
    Any follow-up information on your issue would be appreciated. Please have the courtesy to report back.

  4. #14
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    Re: Kernel 4.15RC (Release Candidate) series

    So 18.04 did get a new patched 4.14 kernel today, runs fine, don't know about performance yet. Image shows cpu_insecure flag meaning the patch is in effect:



    So I benchmarked in Geekbench 4, multi 2.21% slower after patch and single is 0.2% slower, not a big deal imho. One can live with it.
    Last edited by howefield; January 5th, 2018 at 08:04 PM. Reason: posts combined.
    Ubuntu 18.04 Z87-A - 4790K@4.8GHz 16GB@2133MHz GTX1070 8GB Xonar Essence ST
    Windows 10/VMWare Ubuntu Maximus VIII Hero 6700K@4.7GHz 32GB@3200MHz GTX1080Ti@water UR22
    X: AOC Q2770PQU 1440P S-PLS

  5. #15
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    Re: Kernel 4.15RC (Release Candidate) series

    There is a very rare -rc9 this cycle. see here.
    Any follow-up information on your issue would be appreciated. Please have the courtesy to report back.

  6. #16
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    Re: Kernel 4.15RC (Release Candidate) series

    Thanks Doug:
    I am happy they did fix this one:
    Code:
    Cong Wang (2):
          tipc: fix a memory leak in tipc_nl_node_get_link()
          tun: fix a memory leak for tfile->tx_array
    How is it running for you? I see a few stutters here and there, very small and few and far between..
    With realization of one's own potential and self-confidence in one's ability, one can build a better world.
    Dalai Lama>>
    Code Tags

  7. #17
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    Re: Kernel 4.15RC (Release Candidate) series

    Quote Originally Posted by 1fallen View Post
    How is it running for you?
    It has been O.K. for me. I have only been running -rc9 for a few hours now. I missed -rc7 and -rc8 and did some performance comparisons with -rc6 (which I should really re-do with -rc9, as things have been so dynamic).
    Any follow-up information on your issue would be appreciated. Please have the courtesy to report back.

  8. #18
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    Re: Kernel 4.15RC (Release Candidate) series

    I'm getting "do_IRQ: 0.55 No irq handler for vector" on boot up using 4.15 with nvidia. There's several issues regarding this:
    do_irq_error

    Linus and others are talking about timing issues on the last link.
    Last edited by VMC; February 8th, 2018 at 07:39 PM.

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