ACK: [PATCH] [G/master] UBUNTU: packaging: arm64: introduce a 64KB mem pages flavour called 'generic-64k'
andrea.righi at canonical.com
Fri Sep 18 15:34:35 UTC 2020
On Fri, Sep 18, 2020 at 04:07:11PM +0200, Paolo Pisati wrote:
> This patch introduces an arm64 64KB pages enabled flavour of the generic kernel,
> called 'generic-64k'.
> Earlier benchmark with this config have shown an obvious trade-off:
> * Performance
> - comparing geometic mean of over 35 stress throughput tests we see
> a bogo op throughput increase of 22.0-24.5% with 64K pages compared
> to 4K pages.
> * Memory usage:
> - a simple check of memory used after boot shows that 64K pages uses
> around 3.2-3.6x more memory. The amount of memory being shared also
> increases by 15x more.
> - a 32GB machine is seeing about 480MB more memory consumption, or
> ~ 1.5% less free memory.
> In short, loss of memory because pages are larger but a large performance win
> because of less page table entry references and TLB misses: for machines with
> large memory, this flavour could make sense.
> Since we are introducing an independent flavour, generic is not affected by this
> Signed-off-by: Paolo Pisati <paolo.pisati at canonical.com>
Looks good to me.
Acked-by: Andrea Righi <andrea.righi at canonical.com>
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