From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp3.euronet.nl (smtp3.euronet.nl [194.134.35.173]) by ozlabs.org (Postfix) with ESMTP id 498AFDDE28 for ; Thu, 30 Oct 2008 07:44:09 +1100 (EST) Received: from arv-010 (mf-22dc1.mxs.adsl.euronet.nl [81.70.75.193]) by smtp3.euronet.nl (Postfix) with ESMTP id 8D69039FE0 for ; Wed, 29 Oct 2008 21:13:59 +0100 (MET) Received: from arv-010 (localhost [127.0.0.1]) by arv-010 (Postfix) with ESMTP id 4DEE37154B for ; Wed, 29 Oct 2008 21:13:59 +0100 (CET) Received: from arv-002.arvoo.nl (unknown [192.168.0.2]) by arv-010 (Postfix) with ESMTP id 96D687154B for ; Wed, 29 Oct 2008 21:13:52 +0100 (CET) Message-ID: <98283DE153354E85B4A428635DACF6AE@Rini1> From: "Rini van Zetten" To: Subject: Performance questions about SATA-ports MPC8377 Date: Wed, 29 Oct 2008 21:13:47 +0100 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0135_01C93A0B.3B633B20" List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This is a multi-part message in MIME format. ------=_NextPart_000_0135_01C93A0B.3B633B20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello List, We do have some issues with the SATA ports on the Freescale MPC8377. The = problem is that the read performance collapsed when both sata ports=20 are used simultaneously. Reading from one disk gives about 90 - MB/sec Reading from a raid-0 system gives about 80 MB sec. ( same test on a=20 intel computer gives 160 MB/sec) Reading from two disks simultaneously gives about 40 MB/sec / disk We use the linux 2.6.26-6 kernel. questions : 1) Is this a known issue ? 2) Should the hardware be able to simultaneously read from both ports ? 3) Where can i find the latest linux driver available for the SATA port = ? 4) Do you have any tips to increase the performance on the SATA ports ? Regards, Rini van Zetten, ARVOO Engineering B.V. ------=_NextPart_000_0135_01C93A0B.3B633B20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hello List,

We do have some issues with the SATA ports on the Freescale = MPC8377. The=20 problem is that the read performance collapsed when both sata ports =
are used=20 simultaneously.

Reading from one disk gives about 90 - = MB/sec
Reading=20 from a raid-0 system gives about 80 MB sec. ( same test on a
intel = computer=20 gives 160 MB/sec)
Reading from two disks simultaneously gives about = 40 MB/sec=20 / disk

We use the linux 2.6.26-6 kernel.

questions = :

1) Is=20 this a known issue ?
2) Should the hardware be able to simultaneously = read=20 from both ports ?
3) Where can i find the latest linux driver = available for=20 the SATA port ?
4) Do you have any tips to increase the performance = on the=20 SATA ports ?

Regards,

Rini van Zetten,

ARVOO Engineering = B.V.

------=_NextPart_000_0135_01C93A0B.3B633B20--