Re: [PATCH] Performance Improvement in CRC16 Calculations.

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To: Jeffrey Lien <Jeff.Lien@xxxxxxx>
Subject: Re: [PATCH] Performance Improvement in CRC16 Calculations.
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Date: Fri, 24 Aug 2018 12:30:29 -0400
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, "linux-kernel\@vger.kernel.org" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-crypto\@vger.kernel.org" <linux-crypto@xxxxxxxxxxxxxxx>, "linux-block\@vger.kernel.org" <linux-block@xxxxxxxxxxxxxxx>, "linux-scsi\@vger.kernel.org" <linux-scsi@xxxxxxxxxxxxxxx>, "herbert\@gondor.apana.org.au" <herbert@xxxxxxxxxxxxxxxxxxx>, "tim.c.chen\@linux.intel.com" <tim.c.chen@xxxxxxxxxxxxxxx>, David Darrington <david.darrington@xxxxxxx>, Jeff Furlong <jeff.furlong@xxxxxxx>
In-reply-to: <SN1PR04MB18241CBDC8E4CA5275EE4424EA360@SN1PR04MB1824.namprd04.prod.outlook.com> (Jeffrey Lien's message of "Fri, 24 Aug 2018 15:32:52 +0000")
Organization: Oracle Corporation
References: <1533928331-21303-1-git-send-email-jeff.lien@wdc.com> <yq1in4gq5jf.fsf@oracle.com> <yq1lg8zb2lp.fsf@oracle.com> <20180822062016.GA10356@infradead.org> <SN1PR04MB18241CBDC8E4CA5275EE4424EA360@SN1PR04MB1824.namprd04.prod.outlook.com>
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

Jeffrey,

> So it seems the CONFIG_CRYPTO_CRCT10DIF_PCLMUL=y provides the best
> performance.

Thanks for confirming!

> Are there any negative side effect to this config option?

Other than kernel image size, not really.

-- 
Martin K. Petersen	Oracle Linux Engineering

References:
- [PATCH] Performance Improvement in CRC16 Calculations.
  - From: Jeff Lien
- Re: [PATCH] Performance Improvement in CRC16 Calculations.
  - From: Martin K. Petersen
- Re: [PATCH] Performance Improvement in CRC16 Calculations.
  - From: Martin K. Petersen
- Re: [PATCH] Performance Improvement in CRC16 Calculations.
  - From: Christoph Hellwig
- RE: [PATCH] Performance Improvement in CRC16 Calculations.
  - From: Jeffrey Lien

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