From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
Joel Stanley <joel@jms.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: selftests/powerpc: Relax L1d miss targets for rfi_flush test
Date: Thu, 1 Nov 2018 23:46:51 +1100 (AEDT) [thread overview]
Message-ID: <42m4hr04qlzB4XQ@ozlabs.org> (raw)
In-Reply-To: <20181023080456.2558-1-naveen.n.rao@linux.vnet.ibm.com>
On Tue, 2018-10-23 at 08:04:56 UTC, "Naveen N. Rao" wrote:
> When running the rfi_flush test, if the system is loaded, we see two
> issues:
> 1. The L1d misses when rfi_flush is disabled increase significantly due
> to other workloads interfering with the cache.
> 2. The L1d misses when rfi_flush is enabled sometimes goes slightly
> below the expected number of misses.
>
> To address these, let's relax the expected number of L1d misses:
> 1. When rfi_flush is disabled, we allow upto half the expected number of
> the misses for when rfi_flush is enabled.
> 2. When rfi_flush is enabled, we allow ~1% lower number of cache misses.
>
> Reported-by: Joel Stanley <joel@jms.id.au>
> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
> Tested-by: Joel Stanley <joel@jms.id.au>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/a95ecac5cb2fc8a8ee606991384d33
cheers
prev parent reply other threads:[~2018-11-01 12:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-23 8:04 [PATCH] selftests/powerpc: Relax L1d miss targets for rfi_flush test Naveen N. Rao
2018-10-25 22:07 ` Joel Stanley
2018-11-01 12:46 ` Michael Ellerman [this message]
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