[Comm] Тормоза при копировании файлов

["Алексей Харичев" <tupoybot@googlemail.com>]

Раньше как-то не замечал и жил спокойно, но сегодня вот понадобилось
скопировать 70 Гб с одного диска на другой. На обоих ext3. При
копировании система жутко тормозила, хотя загрузка процессора была
<50%

hdparm -i /dev/sdb:
...
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
...


hdparm -i /dev/sda:
...
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
...

По форумам искал, нашел лишь какие-то невразумительные советы про cfq
и прочую лабуду вроде /proc/sys/vm/swappiness. Ничего не помогло,
естественно.

lspci -vvv:

00:00.0 Host bridge: Intel Corporation 82915G/P/GV/GL/PL/910GL Memory
Controller Hub (rev 0e)
        Subsystem: Intel Corporation 82915G/P/GV/GL/PL/910GL Memory
Controller Hub
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort+ >SERR- <PERR- INTx-
        Latency: 0
        Capabilities: [e0] Vendor Specific Information <?>
        Kernel modules: intel-agp

...

00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6
Family) IDE Controller (rev 05) (prog-if 8a [Master SecP PriP])
        Subsystem: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6
Family) IDE Controller
        Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 18
        Region 0: I/O ports at 01f0 [size=8]
        Region 1: I/O ports at 03f4 [size=1]
        Region 2: I/O ports at 0170 [size=8]
        Region 3: I/O ports at 0374 [size=1]
        Region 4: I/O ports at ffa0 [size=16]
        Kernel driver in use: ata_piix
        Kernel modules: ata_piix, piix

00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA
Controller (rev 05) (prog-if 8f [Master SecP SecO PriP PriO])
        Subsystem: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA Controller
        Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin B routed to IRQ 19
        Region 0: I/O ports at cc00 [size=8]
        Region 1: I/O ports at c880 [size=4]
        Region 2: I/O ports at c800 [size=8]
        Region 3: I/O ports at c480 [size=4]
        Region 4: I/O ports at c400 [size=16]
        Capabilities: [70] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot+,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: ata_piix