lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Sun, 3 Jan 2021 08:12:00 +1100
From:   Herbert Xu <>
To:     Tony W Wang-oc <>
Subject: Re: [PATCH] crypto: x86/crc32c-intel - Don't match some Zhaoxin CPUs

On Tue, Dec 15, 2020 at 06:28:11PM +0800, Tony W Wang-oc wrote:
> The driver crc32c-intel match CPUs supporting X86_FEATURE_XMM4_2.
> On platforms with Zhaoxin CPUs supporting this X86 feature, when
> crc32c-intel and crc32c-generic are both registered, system will
> use crc32c-intel because its .cra_priority is greater than
> crc32c-generic.
> When doing lmbench3 Create and Delete file test on partitions with
> ext4 enabling metadata checksum, found using crc32c-generic driver
> could get about 20% performance gain than using the driver crc32c-intel
> on some Zhaoxin CPUs.
> This case expect to use crc32c-generic driver for these Zhaoxin CPUs
> to get performance gain, so remove these Zhaoxin CPUs support from
> crc32c-intel.
> Signed-off-by: Tony W Wang-oc <>
> ---
>  arch/x86/crypto/crc32c-intel_glue.c | 21 +++++++++++++++++++--
>  1 file changed, 19 insertions(+), 2 deletions(-)

This does not seem to address the latest comment from hpa.

Email: Herbert Xu <>
Home Page:
PGP Key:

Powered by blists - more mailing lists