linux-kernel - Slow clock on AMD 740G chipset

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Message-ID: <874ozu2hcl.fsf@divinity.mikat.iki.fi>
Date:	Tue, 20 Jan 2009 16:16:10 +0200
From:	Mika Tiainen <mikat@....fi>
To:	linux-kernel@...r.kernel.org
Subject: Slow clock on AMD 740G chipset

Hi,

I built a new machine with Gigabyte GA-MA74GM-S2H motherboard that ntpd
can't keep synced. Could this be a kernel bug or is it a hardware
problem?

Installed with Debian 2.6.27 kernel and currently running a self built
2.6.28.1, both have the problem. It's falling behind over 2s/15min:

Jan 19 22:08:23 aeon ntpd[31468]: time reset +2.226349 s
Jan 19 22:24:11 aeon ntpd[31468]: time reset +2.185085 s
Jan 19 22:40:08 aeon ntpd[31468]: time reset +2.308958 s
Jan 19 22:56:23 aeon ntpd[31468]: time reset +2.253836 s
Jan 19 23:13:03 aeon ntpd[31468]: time reset +2.291917 s
Jan 19 23:28:14 aeon ntpd[31468]: time reset +2.091014 s
Jan 19 23:43:47 aeon ntpd[31468]: time reset +2.209660 s
Jan 19 23:59:09 aeon ntpd[31468]: time reset +2.150145 s
Jan 20 00:15:44 aeon ntpd[31468]: time reset +2.256261 s
Jan 20 00:31:47 aeon ntpd[31468]: time reset +2.253873 s

I have tried different clocksources. The machine defaults to hpet,
acpi_pm makes no difference and tsc is even slower, seems to be about
half speed to realtime. When i set current_clocksource to jiffies the
clock stopped completely and I had to reboot.

lspci, kernel log and config:

00:00.0 Host bridge: ATI Technologies Inc RS690 Host Bridge
00:01.0 PCI bridge: ATI Technologies Inc RS690 PCI to PCI Bridge (Internal gfx)
00:06.0 PCI bridge: ATI Technologies Inc RS690 PCI to PCI Bridge (PCI Express Port 2)
00:11.0 SATA controller: ATI Technologies Inc SB700/SB800 SATA Controller [AHCI mode]
00:12.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:12.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:12.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:13.0 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI0 Controller
00:13.1 USB Controller: ATI Technologies Inc SB700 USB OHCI1 Controller
00:13.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller
00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 3a)
00:14.1 IDE interface: ATI Technologies Inc SB700/SB800 IDE Controller
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
00:14.3 ISA bridge: ATI Technologies Inc SB700/SB800 LPC host controller
00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge
00:14.5 USB Controller: ATI Technologies Inc SB700/SB800 USB OHCI2 Controller
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon 2100
01:05.2 Audio device: ATI Technologies Inc Radeon X1200 Series Audio Controller
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)

View attachment "aeon_dmesg" of type "text/plain" (25241 bytes)

View attachment "aeon_config" of type "text/plain" (51651 bytes)

-- 
Mika Tiainen		Always be wary of any helpful item that
mikat@....fi		weighs less than its operating manual.
http://mikat.iki.fi	-- (Terry Pratchett, Jingo)