On Mon, Apr 16, 2012 at 11:17:23AM -0500, Jonathan Nieder wrote:
: Teemu Järvinen wrote:
: At first I noticed that NFS performance is low when tried to access this
: server, and any serious reading attempt leads nfsd consuming all the
: available cpu time. Later it became obvious that the local filesystem
: is to blame, it behaves like there is no DMA.
:
: Please attach full dmesg output from booting and reproducing the problem.
I'll attach my dmesg
: Also, just to rule out a userspace (udev, etc) problem: if you install
: the squeeze kernel on your wheezy/sid system, it doesn't reproduce the
: problem, right?
Well, I might be barking at the wrong tree here?
I'm not able to use the exactly same kernel I was using with squeeze,
it was a custom 2.6.32.8 and I'm not able to fiddle with it as it
seems to not support my usb-keyboard I'm using to poke with it now.
With squeeze's 2.6.32-5-486 tried simple dd if=/dev/zero of=foo (512 MB)
which does not consume all the cpu time. There's a little difference
in performance:
3.2.0-2-486 33.9 MB/s
2.6.32-5-486 45.9 MB/s
However, didn't try this (yet) with 2.6.32 as I didn't have my X
running and didn't know that my dd-test was not heavy enough...
When copying about 1.3 GB over NFS, the cpu load is at 100% -
Pretty sure this was not the case when running squeeze.
--
Teemu
[0.00] Initializing cgroup subsys cpuset
[0.00] Initializing cgroup subsys cpu
[0.00] Linux version 3.2.0-2-486 (Debian 3.2.12-1)
(debian-kernel@lists.debian.org) (gcc version 4.6.3 (Debian 4.6.3-1) ) #1 Tue
Mar 20 18:45:21 UTC 2012
[0.00] BIOS-provided physical RAM map:
[0.00] BIOS-e820: - 0009f800 (usable)
[0.00] BIOS-e820: 0009f800 - 000a (reserved)
[0.00] BIOS-e820: 000f - 0010 (reserved)
[0.00] BIOS-e820: 0010 - 7fff (usable)
[0.00] BIOS-e820: 7fff - 7fff3000 (ACPI NVS)
[0.00] BIOS-e820: 7fff3000 - 8000 (ACPI data)
[0.00] BIOS-e820: fec0 - 0001 (reserved)
[0.00] Notice: NX (Execute Disable) protection missing in CPU!
[0.00] DMI 2.2 present.
[0.00] DMI:/IS7-E2 (Intel i865-ICH5), BIOS 6.00 PG 06/01/2004
[0.00] e820 update range: - 0001 (usable)
== (reserved)
[0.00] e820 remove range: 000a - 0010 (usable)
[0.00] last_pfn = 0x7fff0 max_arch_pfn = 0x10
[0.00] MTRR default type: uncachable
[0.00] MTRR fixed ranges enabled:
[0.00] 0-9 write-back
[0.00] A-B uncachable
[0.00] C-CCFFF write-protect
[0.00] CD000-E uncachable
[0.00] F-F write-through
[0.00] MTRR variable ranges enabled:
[0.00] 0 base 0 mask F8000 write-back
[0.00] 1 disabled
[0.00] 2 disabled
[0.00] 3 disabled
[0.00] 4 disabled
[0.00] 5 disabled
[0.00] 6 disabled
[0.00] 7 disabled
[0.00] x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
[0.00] found SMP MP-table at [c00f5bc0] f5bc0
[0.00] initial memory mapped : 0 - 0180
[0.00] Base memory trampoline at [c009c000] 9c000 size 12288
[0.00] init_memory_mapping: -377fe000
[0.00] 00 - 40 page 4k
[0.00] 40 - 003740 page 2M
[0.00] 003740 - 00377fe000 page 4k
[0.00] kernel direct mapping tables up to 377fe000 @ 17fb000-180
[0.00] RAMDISK: 7fd31000 - 7fff
[0.00] Allocated new RAMDISK: 3753f000 - 377fd884
[0.00] Move RAMDISK from 7fd31000 - 7ffef883 to
3753f000 - 377fd883
[0.00] ACPI: RSDP 000f7750 00014 (v00 IntelR)
[0.00] ACPI: RSDT 7fff3000 0002C (v01 IntelR AWRDACPI 42302E31 AWRD
)
[0.00] ACPI: FACP 7fff3040 00074 (v01 IntelR AWRDACPI 42302E31 AWRD
)
[0.00] ACPI: DSDT 7fff30c0 0445C (v01 INTELR AWRDACPI 1000 MSFT
010E)
[0.00] ACPI: FACS 7fff 00040
[0.00] ACPI: APIC 7fff7540 00068 (v01 IntelR AWRDACPI 42302E31 AWRD
)
[0.00] ACPI: Local APIC address 0xfee0
[0.00] 1159MB HIGHMEM available.
[0.00] 887MB LOWMEM available.
[0.00] mapped low ram: 0 - 377fe000
[0.00] low ram: 0 - 377fe000
[0.00] Zone PFN ranges:
[0.00] DMA 0x0010 - 0x1000
[0.00] Normal 0x1000 - 0x000377fe
[0.00] HighMem 0x000377fe - 0x0007fff0
[0.00] Movable zone start PFN for each node
[0.00] early_node_map[2] active PFN ranges
[0.00] 0: 0x0010 - 0x009f
[0.00] 0: 0x0100 - 0x0007fff0
[0.00] On node 0
