Messages in this thread |  | | Date | Fri, 21 Sep 2018 14:54:32 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [Problem] Cache line starvation |
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On Fri, 21 Sep 2018, Peter Zijlstra wrote: > On Fri, Sep 21, 2018 at 02:02:26PM +0200, Sebastian Andrzej Siewior wrote: > > We reproducibly observe cache line starvation on a Core2Duo E6850 (2 > > cores), a i5-6400 SKL (4 cores) and on a NXP LS2044A ARM Cortex-A72 (4 > > cores). > > > > The problem can be triggered with a v4.9-RT kernel by starting > > > Daniel reported that disabling ticket locks on 4.4 makes the problem go > > away, but he hasn't run a long time test yet and as we saw with 4.14 it can > > take quite a while. > > On 4.4 and 4.9 ARM64 still uses ticket locks. So I'm very interested to > know if the ticket locks on x86 really fix or just make it harder.
We can run 4.4. with ticket locks over the weekend.
Thanks,
tglx
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