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[Xen-users] Re: [Xen-devel] Re: xen 2.0.7 on VIA C3 (EPIA)

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Re: [Xen-devel] Re: xen 2.0.7 on VIA C3 (EPIA)
From: Helmut Wollmersdorfer <helmut.wollmersdorfer@xxxxxx>
Date: Tue, 06 Sep 2005 19:51:32 +0200
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Chris Brookes wrote:
No. But I compiled Kernel 2.6.12.4 yesterday with 'CONFIG_M386=y', got
some warnings from the compiler related to '486 and higher instruction
set', and will try this kernel today on my EPIAs ME6000.

Let us know how you get on.

Seems fine. See the graphs at http://212.186.65.206/munin/nack.at/via2.nack.at.html (reboot at 17:00). Just for avoidance of confusing: This is a stock Debian Kernel 2.6.12.4 plus patches vserver 2.0 and vt1211.

I have a ME6000 board in another system,

I assume it in the XEN source, if other kernels are running (2.4.24, 2.6.8 and now 2.6.12.4 work fine).

so if you have any success I'll have to swap them out. I think it has
the exact same CPU (aside from speed) though :-/

Yes:
via2:~# cat /proc/cpuinfo
processor       : 0
vendor_id       : CentaurHauls
cpu family      : 6
model           : 7
model name      : VIA Samuel 2
stepping        : 3
cpu MHz         : 599.993
cache size      : 64 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu de tsc msr cx8 mtrr pge mmx 3dnow
bogomips        : 1187.84

Maybe your chipset is a little bit different. Here is mine:
via2:~# lspci
0000:00:00.0 Host bridge: VIA Technologies, Inc. VT8623 [Apollo CLE266]
0000:00:01.0 PCI bridge: VIA Technologies, Inc. VT8633 [Apollo Pro266 AGP]
0000:00:0d.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host Controller (rev 80) 0000:00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) 0000:00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) 0000:00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80)
0000:00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82)
0000:00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
0000:00:11.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) 0000:00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 50) 0000:00:12.0 Ethernet controller: VIA Technologies, Inc. VT6102 [Rhine-II] (rev74) 0000:00:14.0 Ethernet controller: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] (rev 36) 0000:01:00.0 VGA compatible controller: VIA Technologies, Inc. VT8623 [Apollo CLE266] integrated CastleRock graphics (rev 03)

The freeze

These low power EPIAs are "cool" - no wonder, that they freeze;-)

is occurring in the actual xen kernel, rather than in the
domain 0 linux/netbsd kernel that gets loaded.

To be serious EPIAs are known to freeze often, which can have several reasons:
- weak power supply
- round "air flow" IDE/DMA cables
- buggy kernel (all before 2.4.23)
- the DMA bug
- the longhaul driver bug
- weak memory
- to warm
- to cold

I have two with exactly same hardware, firmware and software, one running since 2 years (only interrupted at power outage or kernel change), the other freezing sometimes. A few weeks ago I changed the mainboard (had a blown condensator), but after 2 weeks it again freezed. Today I will change memory as a last trial. As a result I have now parts for a third EPIA, which can be expected to run some days - good enough for testing XEN kernels;-)

Maybe you know the lock-up thread at http://forums.viaarena.com/messageview.aspx?catid=28&threadid=60131&enterthread=y with funny esoteric solutions.

Helmut Wollmersdorfer


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