IO Sheduler - Revision history

Porcelinux at 01:54, 20 February 2011

2011-02-20T01:54:03Z

← Older revision		Revision as of 01:54, 20 February 2011
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			* changing I/O scheduler at runtime, in this case, we switch to deadline:
			cd /sys/block/sda/queue
			echo deadline > scheduler

	* benchmark of disk read speed, changing IO scheduler in the kernel.		* benchmark of disk read speed, changing IO scheduler in the kernel.

Porcelinux: moved Sheduling to IO Sheduler

2010-11-12T20:52:19Z

moved Sheduling to IO Sheduler

← Older revision	Revision as of 20:52, 12 November 2010
(No difference)

Porcelinux at 20:51, 12 November 2010

2010-11-12T20:51:43Z

← Older revision		Revision as of 20:51, 12 November 2010
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			* benchmark of disk read speed, changing IO scheduler in the kernel.

	~~== benchmark of disk read speed, changing IO scheduler in the kernel~~

	* del kernel changes:
	Block layer->IO Schedulers->Default I/O scheduler->Anticipatory (DEFAULT_AS)		Block layer->IO Schedulers->Default I/O scheduler->Anticipatory (DEFAULT_AS)
	Processor type and features->Processor family->Preemption Model->Preemptible Kernel (Low-Latency Desktop) (PREEMPT)		Processor type and features->Processor family->Preemption Model->Preemptible Kernel (Low-Latency Desktop) (PREEMPT)

Porcelinux at 20:45, 12 November 2010

2010-11-12T20:45:52Z

New page

== benchmark of disk read speed, changing IO scheduler in the kernel

* del kernel changes:
Block layer->IO Schedulers->Default I/O scheduler->Anticipatory (DEFAULT_AS)
Processor type and features->Processor family->Preemption Model->Preemptible Kernel (Low-Latency Desktop) (PREEMPT)

hdparm -tT /dev/hd[abcd]
/dev/hda:
Timing cached reads: 3036 MB in 2.00 seconds = 1516.74 MB/sec
Timing buffered disk reads: 140 MB in 3.03 seconds = 46.16 MB/sec

/dev/hdb:
Timing cached reads: 3128 MB in 2.00 seconds = 1563.28 MB/sec
Timing buffered disk reads: 156 MB in 3.03 seconds = 51.41 MB/sec

/dev/hdc:
Timing cached reads: 3228 MB in 2.00 seconds = 1611.95 MB/sec
Timing buffered disk reads: 136 MB in 4.02 seconds = 33.81 MB/sec

/dev/hdd:
Timing cached reads: 3144 MB in 2.00 seconds = 1570.76 MB/sec
Timing buffered disk reads: 192 MB in 3.01 seconds = 63.77 MB/sec

----

* TEST2
Block layer->IO Schedulers->Default I/O scheduler->Deadline (DEFAULT_DEADLINE)
Processor type and features->Processor family->Preemption Model->Voluntary Kernel Preemption (Desktop) (PREEMPT_VOLUNTARY)

/dev/hda:
Timing cached reads: 3528 MB in 2.00 seconds = 1762.73 MB/sec
Timing buffered disk reads: 154 MB in 3.03 seconds = 50.77 MB/sec

/dev/hdb:
Timing cached reads: 3868 MB in 2.00 seconds = 1933.38 MB/sec
Timing buffered disk reads: 172 MB in 3.03 seconds = 56.82 MB/sec

/dev/hdc:
Timing cached reads: 3692 MB in 2.00 seconds = 1846.51 MB/sec
Timing buffered disk reads: 164 MB in 3.02 seconds = 54.33 MB/sec

/dev/hdd:
Timing cached reads: 3800 MB in 2.00 seconds = 1899.48 MB/sec
Timing buffered disk reads: 196 MB in 3.01 seconds = 65.18 MB/sec

* TEST3
Block layer->IO Schedulers->Default I/O scheduler->CFQ
Processor type and features->Processor family->Preemption Model->Voluntary Kernel Preemption (Desktop) (PREEMPT_VOLUNTARY)

/dev/hda:
Timing cached reads: 3240 MB in 2.00 seconds = 1618.93 MB/sec
Timing buffered disk reads: 136 MB in 3.01 seconds = 45.14 MB/sec

/dev/hdb:
Timing cached reads: 3644 MB in 2.00 seconds = 1821.72 MB/sec
Timing buffered disk reads: 170 MB in 3.00 seconds = 56.59 MB/sec

/dev/hdc:
Timing cached reads: 3772 MB in 2.00 seconds = 1885.97 MB/sec
Timing buffered disk reads: 164 MB in 3.03 seconds = 54.21 MB/sec

/dev/hdd:
Timing cached reads: 3616 MB in 2.00 seconds = 1806.91 MB/sec
Timing buffered disk reads: 198 MB in 3.01 seconds = 65.80 MB/sec