Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752096Ab2BTEka (ORCPT ); Sun, 19 Feb 2012 23:40:30 -0500 Received: from am1ehsobe005.messaging.microsoft.com ([213.199.154.208]:56257 "EHLO AM1EHSOBE005.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751893Ab2BTEk1 convert rfc822-to-8bit (ORCPT ); Sun, 19 Feb 2012 23:40:27 -0500 X-SpamScore: -15 X-BigFish: VS-15(zz9371I936eK542M1432N98dKzz1202hzz8275bh8275dhz2dh2a8h668h839h8e2h8e3h946hbe9k) X-Forefront-Antispam-Report: CIP:70.37.183.190;KIP:(null);UIP:(null);IPV:NLI;H:mail.freescale.net;RD:none;EFVD:NLI From: Zang Roy-R61911 To: Benjamin Herrenschmidt , Li Yang-R58472 CC: Liu Qiang-B32616 , "jgarzik@pobox.com" , "linuxppc-dev@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" , "linux-ide@vger.kernel.org" Subject: RE: [PATCH V2 RESEND] fsl-sata: I/O load balancing Thread-Topic: [PATCH V2 RESEND] fsl-sata: I/O load balancing Thread-Index: AQHM7SMNDhLNb1Ztb0CSEEQyTvJWRpZFN8Kw Date: Mon, 20 Feb 2012 04:40:21 +0000 Message-ID: <3E027F8168735B46AC006B1D0C7BB002065A30@039-SN2MPN1-012.039d.mgd.msft.net> References: <1329284944-17943-1-git-send-email-qiang.liu@freescale.com> <1329439216.2892.36.camel@pasglop> <94F013E7935FF44C83EBE7784D62AD3F0574273C@039-SN2MPN1-023.039d.mgd.msft.net> <1329448724.2892.43.camel@pasglop> In-Reply-To: <1329448724.2892.43.camel@pasglop> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.193.20.72] Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: freescale.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1622 Lines: 39 > -----Original Message----- > From: linuxppc-dev-bounces+tie-fei.zang=freescale.com@lists.ozlabs.org > [mailto:linuxppc-dev-bounces+tie-fei.zang=freescale.com@lists.ozlabs.org] > On Behalf Of Benjamin Herrenschmidt > Sent: Friday, February 17, 2012 11:19 AM > To: Li Yang-R58472 > Cc: Liu Qiang-B32616; jgarzik@pobox.com; linuxppc-dev@lists.ozlabs.org; > linux-kernel@vger.kernel.org; linux-ide@vger.kernel.org > Subject: RE: [PATCH V2 RESEND] fsl-sata: I/O load balancing > > On Fri, 2012-02-17 at 03:09 +0000, Li Yang-R58472 wrote: > > >I tried a debian install on the p5020ds here and I find SATA to be > > >extremely slow, generating millions of interrupts. I think the > > defaults > > >should be a lot more aggressive at coalescing. > > > > The P5020 has a hardware problem with SATA, making it generate more > > interrupts than it should. A new revision of the silicon will fix it. > > Ok cool. With a bit of luck you guys can send me a new silicon when it's > available then :-) (The one in the board you got me seems to be in a > socket). Ben, We still do not have the a P5020 sample to fix the problem. One workaround is to use the patch ( I think you have noticed the patch): http://git.freescale.com/git/cgit.cgi/ppc/sdk/linux.git/commit/?id=92c0ce1e599e788ffc0908739db9bd5e0dbdad69 and use a SSD hard drive. It will have a usable performance. Thanks. Roy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/