On 11 August 2017 at 00:14, Hauke Mehrtens <ha...@hauke-m.de> wrote:
> This fixes the VDSO problems on the Lantiq VR9 MIPS SoC.
> The gettimeofday() sometimes returned old data because of a cache
> aliasing problems on MIPS CPUs, to work around this problem VDSO
> gettimeofday support was deactivated for MIPS in LEDE.
> This problem made ping show very high times like a delay of 4289967.657
> ms.
>
> 1.000.000 calls to clock_gettime(CLOCK_MONOTONIC, &tp); take 1 second
> without VDSO support and 0.35 seconds with VDSO support on Lantiq VR9.
Any comments on this? It sounds exciting to have this fixed upstream.
It seems the old patch was added in commit 1185e645a773c ("kernel:
disable MIPS VDSO by default until the cache issues have been
resolved").
Felix?
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