linux-kernel - Re: [PATCH 3/3] crypto: tcrypt

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Message-ID: <Y6EyQOBeUT9/PvJT@gondor.apana.org.au>
Date:   Tue, 20 Dec 2022 11:55:44 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Robert Elliott <elliott@....com>
Cc:     davem@...emloft.net, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] crypto: tcrypt - yield at end of test

On Mon, Dec 19, 2022 at 02:37:33PM -0600, Robert Elliott wrote:
> Call cond_resched() to let the scheduler reschedule the
> CPU at the end of each test pass.
> 
> If the kernel is configured with CONFIG_PREEMPT_NONE=y (or
> preempt=none is used on the kernel command line), the only
> time the scheduler will intervene is when cond_resched()
> is called. So, repeated calls to
> 	modprobe tcrypt mode=<something>
> 
> hold the CPU for a long time.
> 
> Signed-off-by: Robert Elliott <elliott@....com>
> ---
>  crypto/tcrypt.c | 1 +
>  1 file changed, 1 insertion(+)

I don't really see the point of this.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt