Bug 11883 – write speed on SD cards with sync on is super duper slow

Bug 11883 - write speed on SD cards with sync on is super duper slow

Summary:

write speed on SD cards with sync on is super duper slow

Status:	RESOLVED INVALID

Product:	SB Touch
Classification:	Unclassified
Component:	OS
Version:	unspecified
Platform:	PC Other

Importance:	-- normal (vote)
Target Milestone:	---
Assigned To:	Richard Titmuss

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2009-04-22 10:25 UTC by Blackketter Dean
Modified:	2009-09-08 09:30 UTC (History)
CC List:	0 users

See Also:
Category:	---

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Description Blackketter Dean 2009-04-22 10:25:51 UTC

Comment 1 Blackketter Dean 2009-04-22 10:29:50 UTC

did a little write test on fab4 media, writing a 1MB file (from /dev/urandom) to the overlay file system, sd card, usb hard drive and usb flash stick.

without sync, writing to any of the media was between 1.5 and 1.8 seconds

with sync turned on with the USB hd it's under 4 seconds.

with sync turned on the usb flash stick, it's about 16 seconds.

with sync turned on, the SD card is about 250 seconds

something's not right.

Comment 2 Blackketter Dean 2009-04-22 10:40:35 UTC

Wow, those kingston 1gb sd cards suck.

retested with a transcend sdhc class 6 4gb drive and with sync it was 5.85 seconds.