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Bug#782333: Server-Kernel built for VIA-Nano thin-client



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I am using this box currently as a bittorrent-seeder with qbittorrent-nox.
The web-interface is nice. Today I built an embedded-server kernel for it. It seems to be
doing quite well so far, but there were problems with the Sandisk-Ultra-USB3 (32GB)
storage-stick, I am using there. It cannot handle all compressed filesystems,
installation of PC-BSD (with LZ4-compressed ZFS-root) on it failed. After that the stick
seemed to be defective, but it resumed work upon completely zeroing it.
Today there was downtime, I spent much of the day, moving seeded files around,
defragmenting and balancing, now it is running again, and the wattage is surprisingly
low: 8W, although the files, it is distributing need to be decompressed permanently,
because they are on LZO-BTRFS.
The maximum wattage, I saw, was at 14W.
I have done some online-research and found VIA-nano devices are rare, there seem to be
quadcores in mini-ITX format, but this configuration is without SMP.
With the stock-kernel dmesg looked like this:

.
..
[    0.040396] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
tlb_flushall_shift: -1
[    0.072464] Freeing SMP alternatives memory: 20K (ffffffff81a1b000 - ffffffff81a20000)
[    0.076761] ftrace: allocating 21614 entries in 85 pages
[    0.124879] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.166078] smpboot: CPU0: Centaur VIA Nano U3500@1000MHz (fam: 06, model: 0f,
stepping: 0a) [    0.168000] Performance Events: no PMU driver, software events only.
[    0.169644] x86: Booted up 1 node, 1 CPUs
[    0.169654] smpboot: Total of 1 processors activated (1994.98 BogoMIPS)
..
.
With the hp-t5550-specific VIA-kernel, it does not appear any faster, but probably it
works more efficiently, with less overhead:
.
..
[    0.000000] hpet clockevent registered
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 997.612 MHz processor
[    0.010031] Calibrating delay loop (skipped), value calculated using timer frequency..
1995.22 BogoMIPS (lpj=9976120) [    0.010043] pid_max: default: 32768 minimum: 301
[    0.010060] ACPI: Core revision 20140424
[    0.042189] ACPI: All ACPI Tables successfully acquired
[    0.050082] Security Framework initialized
[    0.050111] AppArmor: AppArmor disabled by boot time parameter
[    0.050118] Yama: disabled by default; enable with sysctl kernel.yama.*
[    0.050159] Mount-cache hash table entries: 2048 (order: 2, 16384 bytes)
[    0.050168] Mountpoint-cache hash table entries: 2048 (order: 2, 16384 bytes)
[    0.050970] Initializing cgroup subsys memory
[    0.050987] Initializing cgroup subsys devices
[    0.051036] Initializing cgroup subsys freezer
[    0.051051] Initializing cgroup subsys net_cls
[    0.051079] Initializing cgroup subsys blkio
[    0.051101] Initializing cgroup subsys perf_event
[    0.051112] Initializing cgroup subsys net_prio
[    0.051184] mce: CPU supports 0 MCE banks
[    0.051200] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
tlb_flushall_shift: -1
[    0.051209] CPU: Centaur VIA Nano U3500@1000MHz (fam: 06, model: 0f, stepping: 0a)
[    0.063602] ftrace: allocating 20306 entries in 80 pages
[    0.110191] Performance Events: no PMU driver, software events only.
[    0.121369] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.230000] NMI watchdog: disabled (cpu0): hardware events not enabled
[    0.230000] devtmpfs: initialized
..
.
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Attachment: config-3.16.7-ckt9es-via64.xz
Description: application/xz


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