David, Thanks for applying.
On 8/10/2017 4:38 PM, David Miller wrote:
From: Babu Moger <babu.moger@xxxxxxxxxx>
Date: Mon, 7 Aug 2017 17:52:48 -0600
This series of patches updates the memcpy, memset, copy_to_user,
copy_from_user etc for SPARC M7/M8 architecture.
This doesn't build, you cannot assume the existence of "%ncc", it is a
recent addition.
Furthermore there is no need to ever use %ncc in v9 targetted code
anyways.
I'll fix that up, but this was a really disappointing build failure
to hit.
Thank you..
Meanwhile, two questions:
1) Is this also faster on T4 as well? If it is, we can just get rid
of the T4 routines and use this on those chips as well.
At the time of this work, our focus was mostly on T7 and T8. We did not
test this code on T4.
For T4 and other older configs we used NG4 versions. I would think it
would require some
changes to make it work on T4.
2) There has been a lot of discussion and consideration put into how
a memcpy/memset routine might be really great for the local cpu
but overall pessimize performance for other cpus either locally
on the same core (contention for physical resources such as
ports to the store buffer and/or L3 cache) or on other cores.
Has any such study been done into these issues wrt. this new code?
No, we have not done this kind of study.
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