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Date:   Tue, 09 Feb 2021 11:03:21 +1000
From:   Nicholas Piggin <>
To:     Benjamin Herrenschmidt <>,
        Christophe Leroy <>,
        Michael Ellerman <>,,
        Paul Mackerras <>
Subject: Re: [PATCH v5 00/22] powerpc/32: Implement C syscall entry/exit

Excerpts from Christophe Leroy's message of February 9, 2021 1:10 am:
> This series implements C syscall entry/exit for PPC32. It reuses
> the work already done for PPC64.
> This series is based on today's merge-test (b6f72fc05389e3fc694bf5a5fa1bbd33f61879e0)
> In terms on performance we have the following number of cycles on an
> 8xx running null_syscall benchmark:
> - mainline: 296 cycles
> - after patch 4: 283 cycles
> - after patch 16: 304 cycles
> - after patch 17: 348 cycles
> - at the end of the series: 320 cycles
> So in summary, we have a degradation of performance of 8% on null_syscall.
> I think it is not a big degradation, it is worth it.

I guess it's 13% from 283. But it's very nice to use the shared C code.

There might be a few more percent speedup in there we can find later.


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