From: Haren Myneni <haren@linux.vnet.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dan Streetman <ddstreet@ieee.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Herbert Xu <herbert@gondor.apana.org.au>,
Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
mikey@neuling.org, suka@us.ibm.com, Ram Pai <linuxram@us.ibm.com>,
npiggin@gmail.com, Haren Myneni <hbabu@us.ibm.com>
Subject: Re: [PATCH V3 6/6] crypto/nx: Add P9 NX support for 842 compression engine
Date: Tue, 29 Aug 2017 18:02:09 -0700 [thread overview]
Message-ID: <59A60E91.8020803@linux.vnet.ibm.com> (raw)
In-Reply-To: <1504043837.2358.38.camel@kernel.crashing.org>
On 08/29/2017 02:57 PM, Benjamin Herrenschmidt wrote:
> On Tue, 2017-08-29 at 14:54 -0700, Haren Myneni wrote:
>> Opening send window for each crypto transform (crypto_alloc,
>> compression/decompression, ..., crypto_free) so that does not have to
>> wait for the previous copy/paste complete. VAS will map send and
>> receive windows, and can cache in send windows (up to 128). So I
>> thought using the same send window (per chip) for more requests (say
>> 1000) may be adding overhead.
>>
>> I will make changes if you prefer using 1 send window per chip.
>
> Did you check the cost of opening/closing a window ?
No, Not yet. opening / closing happens only during alloc/free, but not for each compression/decompression. Hence used separate send windows.
Thanks
Haren
>
> Cheers,
> Ben.
>
next prev parent reply other threads:[~2017-08-30 1:02 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-22 5:01 [PATCH V3 6/6] crypto/nx: Add P9 NX support for 842 compression engine Haren Myneni
2017-07-24 16:46 ` Ram Pai
2017-08-28 23:25 ` Michael Ellerman
2017-08-29 13:32 ` Dan Streetman
2017-08-31 7:44 ` Haren Myneni
2017-08-31 13:40 ` Dan Streetman
2017-08-31 19:03 ` Haren Myneni
2017-09-01 11:34 ` Michael Ellerman
2017-09-02 4:11 ` Haren Myneni
2017-08-29 6:30 ` Sukadev Bhattiprolu
2017-08-29 13:58 ` Dan Streetman
2017-08-29 21:23 ` Benjamin Herrenschmidt
2017-08-29 21:54 ` Haren Myneni
2017-08-29 21:57 ` Benjamin Herrenschmidt
2017-08-30 1:02 ` Haren Myneni [this message]
2017-08-31 13:31 ` Dan Streetman
2017-08-31 19:09 ` Haren Myneni
2017-09-01 11:29 ` Michael Ellerman
2017-09-02 3:27 ` Haren Myneni
2017-09-02 16:14 ` Dan Streetman
2017-09-02 8:40 ` Haren Myneni
2017-09-02 13:42 ` Michael Neuling
2017-09-02 16:17 ` Dan Streetman
2017-09-03 8:32 ` Haren Myneni
2017-09-03 14:12 ` Dan Streetman
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