Re: [PATCH v2] raid6: arm64: add SVE optimized implementation for syndrome generation

[Mark Brown]

On Thu, Apr 16, 2026 at 05:26:08PM +0100, Robin Murphy wrote:

> Unless you've got a CPU with truly big wide vector units that _can't_ be
> fully utilised by ASMID ops, then SVE is only really offering whatever
> incidental benefits fall out of smaller code size. However, if you do have
> those wider vectors, then the cost of correctly saving/restoring the SVE
> state - of which a userspace benchmark isn't likely to be very
> representative - is also going to scale up significantly.

The other case will be when there's some SVE only extension that
accelerates something that's relevant for the algorithm.  That's not
really a thing at present but I imagine that we'll run into that at some
point.

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