From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Ornati Subject: Re: [Intel-gfx] Interrupt latency on some 945GM platforms -- and TCP/IP silent data corruption? Date: Sat, 16 Oct 2010 17:54:32 +0200 Message-ID: <20101016175432.58e35ce3@gmail.com> References: <201009132336.17310.anarsoul@gmail.com> <201009171002.09187.simon.farnsworth@onelan.co.uk> <4b4d1e0a-b1ad-40f1-a829-6d4726d2b2d3@email.android.com> <201009171550.48480.anarsoul@gmail.com> <20100921202607.2b46ffca@gmail.com> <20100921155653.440afea4@jbarnes-desktop> <20100925122820.37c01ea3@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20100925122820.37c01ea3@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: Paolo Ornati Cc: Jesse Barnes , Vasily Khoruzhick , Simon Farnsworth , intel-gfx@lists.freedesktop.org, Sitsofe Wheeler , Venkatesh Pallipadi , Thomas Gleixner , linux-kernel@vger.kernel.org List-Id: intel-gfx@lists.freedesktop.org On Sat, 25 Sep 2010 12:28:20 +0200 Paolo Ornati wrote: > UPDATE: "processor.max_cstate=2" doesn't solve the sporadic flicker > problem. > > The patch, applied on top of 2.6.35.4, freezes the laptop on boot. > > Summary: > nohz=off good > processor.max_cstate=1 good > processor.max_cstate=2 bad Maybe it's not related but who knows... on this laptop (Asus x5dij / Core(TM)2 Duo CPU T6570) I've another problem: sporadic silent data corruption over TCP/IP! The problem is not easy to reproduce, maybe it's something like this? http://www.zdnet.com/blog/ou/realtek-silent-data-corruption-caused-by-firmware/663 I've first noticed it in two ways: - I download an ISO and sometimes it has wrong MD5, looking closer I find that only a few bytes (in one place) are wrong - ssh detects HMAC corruption When I've tried to reproduce it doing a lot of automated fast tranfers over a gigabit LAN it all worked fine... ;) The intersesting thing is that "processor.max_cstate=1" seems to have cured this problem too! Network controller is this: 03:00.0 Ethernet controller: Atheros Communications Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller (rev b0) Full lspci: 00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 09) 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09) 00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09) 00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03) 00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03) 00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03) 00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03) 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03) 00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03) 00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03) 00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 03) 00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03) 00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03) 00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03) 00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93) 00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03) 00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03) 02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01) 03:00.0 Ethernet controller: Atheros Communications Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller (rev b0) -- Paolo Ornati Linux 2.6.35.7 on x86_64