[Bug 15571] Reduced I/O performance when logged into GNOME

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http://bugzilla.ubuntu.com/show_bug.cgi?id=15571
Ubuntu | UNKNOWN





------- Additional Comments From javier.cabezas at gmail.com  2005-09-30 15:29 UTC -------
I have this poor performance before I login into Gnome:

/dev/hdb:
 Timing cached reads:   640 MB in  2.01 seconds = 319.09 MB/sec
 Timing buffered disk reads:    2 MB in  5.27 seconds = 388.67 kB/sec

but after the login, it gets even worse:

/dev/hdb:
 Timing cached reads:   604 MB in  2.01 seconds = 300.84 MB/sec
 Timing buffered disk reads:    2 MB in  9.04 seconds = 226.51 kB/sec

The info of hdparm about my disk is:

dev/hdb:

ATA device, with non-removable media
	Model Number:       SAMSUNG SV1824D                         
	Serial Number:      0159J2FKB03618
	Firmware Revision:  MD100-31
Standards:
	Used: ATA/ATAPI-4 T13 1153D revision 17 
	Supported: 4 3 2 1 & some of 5
Configuration:
	Logical		max	current
	cylinders	16383	16383
	heads		16	16
	sectors/track	63	63
	--
	bytes/track: 34902	bytes/sector: 554
	CHS current addressable sectors:   16514064
	LBA    user addressable sectors:   35606592
	device size with M = 1024*1024:       17386 MBytes
	device size with M = 1000*1000:       18230 MBytes (18 GB)
Capabilities:
	LBA, IORDY(cannot be disabled)
	Buffer size: 472.0kB	bytes avail on r/w long: 4	Queue depth: 1
	Standby timer values: spec'd by Vendor
	R/W multiple sector transfer: Max = 16	Current = ?
	DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 
	     Cycle time: min=120ns recommended=120ns
	PIO: pio0 pio1 pio2 pio3 pio4 
	     Cycle time: no flow control=120ns  IORDY flow control=120ns
Commands/features:
	Enabled	Supported:
	   *	NOP cmd
	   *	READ BUFFER cmd
	   *	WRITE BUFFER cmd
	   *	Host Protected Area feature set
	   *	DEVICE RESET cmd
	   *	Look-ahead
	   *	Write cache
	   *	Power Management feature set
	   *	SMART feature set
HW reset results:
	CBLID- above Vih
	Device num = 1


And the lspci output is:

0000:00:00.0 Host bridge: Advanced Micro Devices [AMD] AMD-751 [Irongate] System
Controller (rev 23)
0000:00:01.0 PCI bridge: Advanced Micro Devices [AMD] AMD-751 [Irongate] AGP
Bridge (rev 01)
0000:00:04.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South]
(rev 1b)
0000:00:04.1 IDE interface: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
0000:00:04.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 0e)
0000:00:04.4 SMBus: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 20)
0000:00:0e.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
0000:00:0f.0 Multimedia video controller: Brooktree Corporation Bt878 Video
Capture (rev 11)
0000:00:0f.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture
(rev 11)
0000:00:10.0 Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev 08)
0000:01:05.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4 MX
440] (rev a3)

Are these results normal?? I find buffered reads VERY slow.

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