From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id F38D8A05D3 for ; Wed, 27 Mar 2019 12:29:15 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 157C91B163; Wed, 27 Mar 2019 12:29:00 +0100 (CET) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by dpdk.org (Postfix) with ESMTP id 535AD11A4 for ; Sun, 24 Mar 2019 18:37:49 +0100 (CET) Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x2OHSiR1005013 for ; Sun, 24 Mar 2019 13:37:48 -0400 Received: from smtp.notes.na.collabserv.com (smtp.notes.na.collabserv.com [192.155.248.66]) by mx0a-001b2d01.pphosted.com with ESMTP id 2red2yju58-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Sun, 24 Mar 2019 13:37:48 -0400 Received: from localhost by smtp.notes.na.collabserv.com with smtp.notes.na.collabserv.com ESMTP for from ; Sun, 24 Mar 2019 17:37:47 -0000 Received: from us1a3-smtp04.a3.dal06.isc4sb.com (10.106.154.237) by smtp.notes.na.collabserv.com (10.106.227.127) with smtp.notes.na.collabserv.com ESMTP; Sun, 24 Mar 2019 17:37:37 -0000 Received: from us1a3-mail95.a3.dal06.isc4sb.com ([10.146.21.14]) by us1a3-smtp04.a3.dal06.isc4sb.com with ESMTP id 2019032417373726-404687 ; Sun, 24 Mar 2019 17:37:37 +0000 MIME-Version: 1.0 In-Reply-To: To: Shahaf Shuler Cc: "bruce.richardson@intel.com" , Chao Zhu , Dekel Peled , "dev@dpdk.org" , David Christensen , "honnappa.nagarahalli@arm.com" , "konstantin.ananyev@intel.com" , "ola.liljedahl@arm.com" , Ori Kam , Thomas Monjalon , David Wilder , Yongseok Koh From: "Pradeep Satyanarayana" Date: Sun, 24 Mar 2019 09:37:34 -0800 References: <1552913893-43407-1-git-send-email-dekelp@mellanox.com> <11283309.AIL3tCH6tf@xps> <4334064.10fvSv6A2r@xps> X-KeepSent: B810109E:4E511E37-882583C7:0060A84E; type=4; name=$KeepSent X-Mailer: IBM Notes Release 9.0.1EXT SHF993 September 20, 2018 X-LLNOutbound: False X-Disclaimed: 13879 X-TNEFEvaluated: 1 x-cbid: 19032417-6357-0000-0000-00000A1E3F31 X-IBM-SpamModules-Scores: BY=0.293549; FL=0; FP=0; FZ=0; HX=0; KW=0; PH=0; SC=0.433748; ST=0; TS=0; UL=0; ISC=; MB=0.000014 X-IBM-SpamModules-Versions: BY=3.00010807; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000282; SDB=6.01179073; UDB=6.00616929; IPR=6.00959776; BA=6.00006267; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00026138; XFM=3.00000015; UTC=2019-03-24 17:37:45 X-IBM-AV-DETECTION: SAVI=unsuspicious REMOTE=unsuspicious XFE=unused X-IBM-AV-VERSION: SAVI=2019-03-22 07:23:47 - 6.00009725 x-cbparentid: 19032417-6358-0000-0000-0000568A42F4 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-03-24_10:, , signatures=0 X-Proofpoint-Spam-Reason: safe X-Mailman-Approved-At: Wed, 27 Mar 2019 12:28:50 +0100 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Subject: Re: [dpdk-dev] [PATCH] eal/ppc: remove fix of memory barrier for IBM POWER X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Message-ID: <20190324173734.xaz785qbB_cFHlY_1rbXmZasB2yfaPdvPlmo2OCBKHw@z> Shahaf Shuler wrote on 03/23/2019 11:37:42 PM: > From: Shahaf Shuler > To: "pradeep@us.ibm.com" , Thomas Monjalon > > Cc: "bruce.richardson@intel.com" , Chao > Zhu , Dekel Peled , > "dev@dpdk.org" , David Christensen , > "honnappa.nagarahalli@arm.com" , > "konstantin.ananyev@intel.com" , > "ola.liljedahl@arm.com" , Ori Kam > , David Wilder , Yongseok Koh > > Date: 03/23/2019 11:37 PM > Subject: RE: [PATCH] eal/ppc: remove fix of memory barrier for IBM POWER > > Pradeep, > > Pradeep Satyanarayana wrote on Saturday, March 23, 2019 12:58 AM > >Thomas Monjalon wrote on 03/22/2019 10:51:17 AM: > >> Date: 03/22/2019 10:51 AM > >> Subject: Re: [PATCH] eal/ppc: remove fix of memory barrier for IBM POWER > >> > >> 22/03/2019 16:30, Pradeep Satyanarayana: > >> > Thomas Monjalon wrote on 03/22/2019 01:49:03 AM: > >> > > 22/03/2019 02:40, Pradeep Satyanarayana: > >> > > > - rte=5F[rw]mb (general memory barrier) --> should be lwsync > >> > > > >> > > This is what may be discussed. > >> > > The assumption is that the general memory barrier should cover > >> > > all cases (CPU caches, SMP and I/O). > >> > > That's why we think it should "sync" for Power. > >> > > >> > In that case, at a minimum we must de-link rte=5Fsmp=5F[rw]mb from rte=5F[rw]mb > >> > and retain it as lwsync. Agreed? > >> > >> I have no clue about what is needed for SMP barrier in Power. > >> As long as it works as expected, no problem. > >> > > > >We will try that out and report back here, later next week > > Till then, i think there are 2 orthogonal issues: > 1. ppc rte=5Fwmb is incorrect > 2. ppc rte=5Fsmp=5F[rw]mb may be improved. > > for #1 the current patch from Dekel seems to be OK. do you agree? > for #2 i guess you will check and come back w/ patch/answer? That has been the line of thinking. However, we need to do some extensive testing to confirm that it all holds up. Thanks Pradeep pradeep@us.ibm.com