Re: [PATCH v2] raid6: arm64: add SVE optimized implementation for syndrome generation
Mark Brown <[email protected]>
| Newsgroups | gmane.linux.raid,gmane.linux.ports.arm.kernel,gmane.linux.kernel |
|---|---|
| Message-ID | <[email protected]> |
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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