maemo.org - Talk - Deleted /usr/bin, can't boot, can't flash, Important data on N900

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- - Deleted /usr/bin, can't boot, can't flash, Important data on N900 (https://talk.maemo.org/showthread.php?t=87190)

Re: Deleted /usr/bin, can't boot, can't flash, Important data on N900

The above 64GB card seems to work fine for me.
Has two 800MB swaps and the rest data (FAT).
I don't have any random I/O figures tho.

Re: Deleted /usr/bin, can't boot, can't flash, Important data on N900

Care to do a stress-test? There are tools/benchmarks to do it, but generating 10000 1kb files and simple >> to them of a single char in random order should help. Random read/writes usually are in orders of 100kb/s, continuous writes for HD recording keep the Mb/s figures from your post.

Re: Deleted /usr/bin, can't boot, can't flash, Important data on N900

Quote:

Originally Posted by szopin (Post 1275540)

my aim was to get an idea of the performance i may expect from the µSDXC in the N900
(do the tools you refer to run on the N900?)
i guess i could use a dd command with bs=1kb but it wouldn't be random, now, would it?

i have added a 2GB swap partition at the end of the card and reserved most of the space for a ext2 partition for my still to be compiled "local repository" of extras+testing+dev

i guess for swap your kbs size case could apply but otherwise? i don't run an OS on the µSD card, thus...

Re: Deleted /usr/bin, can't boot, can't flash, Important data on N900

There was a tool for benchmarking sd cards straight on maemo, can't find it now... What I found was my post after getting much advertised fast random IO samsung class 10:
http://talk.maemo.org/showpost.php?p...&postcount=132

Benchmark on different OS with usb connected or through card reader shouldn't be that far away though.

Re: Deleted /usr/bin, can't boot, can't flash, Important data on N900

i'll give the dd with bs=1kb a run for its money next time around, but don't hold your breath, okay?

actually, i also need to put it in the 808 PV and check whether the full resolution pictures save faster on it then on the internal flash (about 5 sec :mad:)
considering the sustained write speed & the 10MB size of a 38 MP jpg, that should go down to about 2 sec :p
unless there is a lot of processing involved :eek:

Re: Deleted /usr/bin, can't boot, can't flash, Important data on N900

Code:

Nokia-N900:/media/mmc1/bonnie# bonnie++ -d . -s 512m -n 1 -b -u user

Using uid:29999, gid:29999.

Writing a byte at a time...done

Writing intelligently...done

Rewriting...done

Reading a byte at a time...done

Reading intelligently...done

start 'em...done...done...done...done...done...

Create files in sequential order...done.

Stat files in sequential order...done.

Delete files in sequential order...done.

Create files in random order...done.

Stat files in random order...done.

Delete files in random order...done.

Version  1.96       ------Sequential Output------ --Sequential Input- --Random-

Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--

Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP

Nokia-N900     512M   254  98  2968   5  3443   5   738  94 15409  13 555.1  47

Latency               139ms    5771ms    2809ms   66437us     199ms     775ms

Version  1.96       ------Sequential Create------ --------Random Create--------

Nokia-N900          -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--

              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP

                  1    82  33 +++++ +++   199  11   134  39 +++++ +++   185  21

Latency               441ms   54198us     104ms   50690us   32500us     102ms

1.96,1.96,Nokia-N900,1,1349212260,512M,,254,98,2968,5,3443,5,738,94,15409,13,555.1,47,1,,,,,82,33,+++++,+++,199,11,134,39,+++++,+++,185,21,139

ms,5771ms,2809ms,66437us,199ms,775ms,441ms,54198us,104ms,50690us,32500us,102ms

to be compared with... this
didn't see that post until after i had started the command so that'll have to do for a 1st run

parameters are not the same, but performance seems roughly 50% higher...

Re: Deleted /usr/bin, can't boot, can't flash, Important data on N900

Please post exact commands to run, will try with my samsung sdhc which gave me x5 boost some half a year ago vs best at that time. Really hoping sd developments are catching up, booting ubuntu might end up being faster than maemo ;)

Or is it just bonnie++?

Re: Deleted /usr/bin, can't boot, can't flash, Important data on N900

Quote:

Originally Posted by szopin (Post 1275610)

hey, don't shoot the messenger, will you?
the command i used is 1st line
on the post i refer to the command is slightly different (lasts over an hr... i had about 10 min)
will get back with later, but might take some time (can't leave the darn thing lying around for an hour not doing anything, now, can i ?!?)

honestly, i think the performances from my 1st post earlier strike me as much more realistic then all that "stat" stuff, but... less "standard" obviously

Re: Deleted /usr/bin, can't boot, can't flash, Important data on N900

Know that feel :D Seriously interested though. I do remember a thred on tmo comparing random vs consequential io performance of sd cards with some benchmark tool, but my googlefu fails me totally. While looking into it 300kb/s for random on class 10 was around 1/5th (1/4th maybe?) of what fastest class 2 cards were giving and given huge boost in consequential seemed like the best option. Really hope this improved. Even then people were considering moving swap to sd, if it improves like calculating power, we might soon move to keeping rootfs on sd card and get speed boost out of it (not to mention more rootfs space).