Thanks for the response. I got the parameter in question from one of the
mailing lists where it is claimed to increase the performance. In my
case however, it did not make much of a difference. I am pasting the
output from "hdparm -i" as well as "hdparm -I" which gives us the
information about the disk.
Srikanth
# hdparm -i /dev/sda
/dev/sda:
HDIO_GET_IDENTITY failed: Inappropriate ioctl for device
# hdparm -I /dev/sda
/dev/sda:
ATA device, with non-removable media
Model Number: SAMSUNG HM100JI
Serial Number: S0EFJ10L500218
Firmware Revision: YH100-13
Standards:
Used: ATA/ATAPI-7 T13 1532D revision 0
Supported: 7 6 5 4
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 195371568
LBA48 user addressable sectors: 195371568
device size with M = 1024*1024: 95396 MBytes
device size with M = 1000*1000: 100030 MBytes (100 GB)
Capabilities:
LBA, IORDY(can be disabled)
Queue depth: 32
Standby timer values: spec'd by Standard, no device specific minimum
R/W multiple sector transfer: Max = 16 Current = 16
Advanced power management level: unknown setting (0x0080)
Recommended acoustic management value: 254, current value: 0
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5
*udma6 udma7
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:
* SMART feature set
Security Mode feature set
* Power Management feature set
* Write cache
* Look-ahead
* Host Protected Area feature set
* WRITE_BUFFER command
* READ_BUFFER command
NOP cmd
* DOWNLOAD_MICROCODE
Advanced Power Management feature set
SET_MAX security extension
Automatic Acoustic Management feature set
* 48-bit Address feature set
* Device Configuration Overlay feature set
* Mandatory FLUSH_CACHE
* FLUSH_CACHE_EXT
* SMART error logging
* SMART self-test
General Purpose Logging feature set
* IDLE_IMMEDIATE with UNLOAD
* SATA-I signaling speed (1.5Gb/s)
* Native Command Queueing (NCQ)
* Host-initiated interface power management
* Phy event counters
DMA Setup Auto-Activate optimization
Device-initiated interface power management
* Software settings preservation
Security:
Master password revision code = 65534
supported
not enabled
not locked
frozen
not expired: security count
supported: enhanced erase
88min for SECURITY ERASE UNIT. 88min for ENHANCED SECURITY ERASE
UNIT.
Checksum: correct
Lonni J Friedman wrote:
> With a similar setup I'm seeing about 60MB/s for buffered disk reads
> using sata_nv. Why are you booting with the combined_mode=libata
> option? Does the performance change without that option?
>
> Specifically what kind of SATA disk are you using?
>
> On 4/9/07, Srikanth Konjarla <srikanth.konjarla@xxxxxxxxx> wrote:
>> All,
>>
>> I am running FC6 (with latest update, 64-bit) on AMD Dual Core with 1GB
>> RAM. It contains a SATA hard disk. I am experience sluggishness when
>> files are opened or closed (saved). I suspect that i have slow SATA
>> performance even though i am not sure. I have following stats.
>>
>> # hdparm -Tt /dev/sda
>>
>> /dev/sda:
>> Timing cached reads: 2452 MB in 2.00 seconds = 1226.48 MB/sec
>> Timing buffered disk reads: 86 MB in 3.03 seconds = 28.35 MB/sec
>>
>> I am concerned about 28.35 MB/Sec speed here.
>>
>> # hdparm -i /dev/sda
>>
>> /dev/sda:
>> HDIO_GET_IDENTITY failed: Inappropriate ioctl for device
>>
>> # dmesg | grep -i sata
>> sata_nv 0000:00:0e.0: version 3.2
>> ata1: SATA max UDMA/133 cmd 0xE800 ctl 0xE482 bmdma 0xE000 irq 21
>> ata2: SATA max UDMA/133 cmd 0xE400 ctl 0xE082 bmdma 0xE008 irq 21
>> scsi0 : sata_nv
>> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>> scsi1 : sata_nv
>> ata2: SATA link down (SStatus 0 SControl 300)
>>
>> # lsmod | grep -i sata
>> sata_nv 29509 4
>> libata 120553 1 sata_nv
>>
>> Kernel Boot Parameter
>> kernel /vmlinuz-2.6.20-1.2933.fc6 ro root=LABEL=/1 noquiet
>> combined_mode=libata
>>
>> Any suggestions/recommendations/comments are welcome.
>>
>> Thanks
>>
>> Srikanth
>
