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2007-02-05
, 11:30
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Posts: 2,152 |
Thanked: 1,490 times |
Joined on Jan 2006
@ Czech Republic
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#2
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2007-02-05
, 12:54
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Posts: 16 |
Thanked: 0 times |
Joined on Jan 2007
@ Munich, Germany
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#3
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2007-02-05
, 14:41
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Posts: 3,401 |
Thanked: 1,255 times |
Joined on Nov 2005
@ London, UK
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#4
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/home/user # time dd if=/dev/mmcblk1 of=/dev/null bs=8192 count=10240 10240+0 records in 10240+0 records out real 0m 10.41s user 0m 0.03s sys 0m 1.10s
/home/user # time dd if=/dev/mmcblk0 of=/dev/null bs=8192 count=10240 10240+0 records in 10240+0 records out real 0m 10.50s user 0m 0.01s sys 0m 1.28s
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2007-02-05
, 16:40
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Posts: 3,096 |
Thanked: 1,525 times |
Joined on Jan 2006
@ Michigan, USA
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#5
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2007-02-05
, 17:19
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Posts: 3,401 |
Thanked: 1,255 times |
Joined on Nov 2005
@ London, UK
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#6
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2007-02-05
, 17:29
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Posts: 3,401 |
Thanked: 1,255 times |
Joined on Nov 2005
@ London, UK
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#7
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2007-02-05
, 18:54
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Posts: 152 |
Thanked: 6 times |
Joined on Dec 2006
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#8
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I'm running the SDHC Kernel posted by Unhinged (post #73 I think) in the "4GB+ work/not working" thread. I booted off jffs2 flash, and tested over SSH.
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2007-02-05
, 18:55
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Posts: 152 |
Thanked: 6 times |
Joined on Dec 2006
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#9
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I've just run the read test against a second N800 with stock Nokia 51-6 kernel and the SD card (1GB SD) in this device has returned a time of 11.23s (external slot) while a 1GB RS-MMC card turns in 37.22s (internal slot).
So it would seem all my SD cards - whether SD or SDHC, custom or stock kernel - turn in read times between 10.41 - 11.23 seconds, not fantastic and hopefully we can do better. RS-MMC is obviously much much worse - I'm using it for swap but not for much longer!
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2007-02-05
, 19:03
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Posts: 2,152 |
Thanked: 1,490 times |
Joined on Jan 2006
@ Czech Republic
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#10
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/dev/mmcblk0 = Internal slot = A-DATA 8GB SDHC card
/dev/mmcblk1 = External slot = Nokia miniSD 128MB card (the one that came with the N800)
Just in case anyone interested, here are the results:
2nd test = internal raw sd data (sdhc)
3rd test = external raw sd data (minisd)
Basically this is the reading speed and it seem like flash is about 2x faster than the SDHC card. Appearanly even w/ twice the read speed, the jffs2 compression overhead is more than the bandwidth difference, and that's why SD card boot faster.
2nd test = ext2 internal SDHC
3rd test = vfat internal SDHC
4th test = vfat external miniSD
second set of tests are written test. For obvious reason, the SDHC card written faster than mini SD, but appearently ext2 written faster than fat32 also. And jffs2 is the worst among all even if it's on the flash.