From: Christoph Hellwig <hch@lst.de>
To: David Laight <david.laight.linux@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>,
Eric Biggers <ebiggers@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
x86@kernel.org, linux-raid@vger.kernel.org
Subject: Re: [PATCH v3] lib/raid/xor: x86: Add AVX-512 optimized xor_gen()
Date: Thu, 18 Jun 2026 11:25:00 +0200 [thread overview]
Message-ID: <20260618092500.GC17530@lst.de> (raw)
In-Reply-To: <20260617110516.0a70950e@pumpkin>
On Wed, Jun 17, 2026 at 11:05:16AM +0100, David Laight wrote:
> > FYI, one or 2 sources are basically useless as they RAID5 configs
> > that have no benefits over simple mirroring and thus the numbers
> > aren't too interesting.
>
> With three disks you xor two buffers (src_count == 1) to get the parity
> to write to the third - so that is a valid RAID5 config.
Sure. It did not say it is invalid, it just isn't very useful.
next prev parent reply other threads:[~2026-06-18 9:25 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-15 19:03 [PATCH v3] lib/raid/xor: x86: Add AVX-512 optimized xor_gen() Eric Biggers
2026-06-15 19:25 ` sashiko-bot
2026-06-15 20:10 ` Eric Biggers
2026-06-15 21:16 ` Borislav Petkov
2026-06-15 21:29 ` Eric Biggers
2026-06-15 23:53 ` Borislav Petkov
2026-06-16 0:29 ` Dave Hansen
2026-06-17 5:44 ` Christoph Hellwig
2026-06-16 8:13 ` David Laight
2026-06-17 5:56 ` Christoph Hellwig
2026-06-17 10:05 ` David Laight
2026-06-18 9:25 ` Christoph Hellwig [this message]
2026-06-18 9:59 ` David Laight
2026-06-17 15:44 ` Eric Biggers
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