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Mentalist Traceur |
2011-02-17
, 23:58
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Posts: 2,225 |
Thanked: 3,822 times |
Joined on Jun 2010
@ Florida
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#51
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Originally Posted by TiagoTiago
Yes, as I understand it, that's exactly why. Run "ls" on the "/sys/block" directory. If there's no mmcblk1 folder in there, then your device just doesn't see that piece of hardware - not having it in there at all being a logical reason for it not being able to see it.
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2011-02-18
, 00:36
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Posts: 701 |
Thanked: 585 times |
Joined on Sep 2010
@ London, England
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#52
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Originally Posted by joerg_rw
Do you know what the MMC-driver actually does? It appears to simply make the device unavailable without unmounting it, but appearances can be deceiving so maybe it does more than that.
I'd guess it's done by the MMC-driver in kernel. There's definitely no hw switching off uSD slot the hard way, but given the fact you can ruin a card by inadvertently removing it, I won't suggest to override this mechanism.
/j
And when you say ruin, do you mean simply corrupt the data on it by not leaving it in a clean state or do you mean electrically damage so it can't be used again? If you just mean might corrupt the data on the card, I don't see how the driver removing the device without unmounting the filesystem is any better than yanking the card.
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2011-02-18
, 02:53
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Posts: 2,225 |
Thanked: 3,822 times |
Joined on Jun 2010
@ Florida
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#53
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(Typing this on the FastSMSEvo keyboard in portrait mode - N900 sure has come far with so little manufacturer support.) Anyway, I'm pretty certain it unmounts it. Simply making the card/MyDocs unaccessible would be useless for the only reason that's even implemented - making sure the file systems/partitions don't get raped. Nokia execs might be stupid but their programmers aren't, mostly.
And, yes, were talking about corruption digitally, not physical damage.
So yes, that is different than making the cards inaccessible. (If cards were inaccessible but mounted, I'm pretty sure it would mess up your storage just about every time you used Mass Storage mode, without jumping through way too many hoops. Just a guess though, I am by no means an expert.)
And, yes, were talking about corruption digitally, not physical damage.
So yes, that is different than making the cards inaccessible. (If cards were inaccessible but mounted, I'm pretty sure it would mess up your storage just about every time you used Mass Storage mode, without jumping through way too many hoops. Just a guess though, I am by no means an expert.)
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2011-02-18
, 12:53
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Posts: 2,222 |
Thanked: 12,651 times |
Joined on Mar 2010
@ SOL 3
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#54
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Originally Posted by retsaw
I mean electrical (or lowest level logical) damage caused by breaking power supply so a erase or flash cycle gets aborted. (possible) Result: card defect, bin it.
... And when you say ruin, do you mean simply corrupt the data on it by not leaving it in a clean state or do you mean electrically damage so it can't be used again?
/j
__________________
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
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First USB hostmode fanatic, father of H-E-N
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member
EX Hildon Foundation approved Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/
IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N
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2011-02-18
, 16:49
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Posts: 284 |
Thanked: 320 times |
Joined on May 2010
@ Peterborough, UK
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#55
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Originally Posted by hawaii
I also think scheduler changing (BFS?), ramzez and a change to SLUB/SLAB/SLOB/SLQB will yield the best results. The android kids have been messing with this stuff much more, unfortunately they don't always document it. They just drop kernel **** in a ROM and push it.
Not sure on the SLUB/SLAB/SLOB/SLQB argument, but ramzez is basically just a port of compcache. I've tried to incorporate it into the BFS kernel, but Nokia screwed around so much with the swapping code (to try to align pages) that unfortunately it's unstable, especially with the swap notify patch (even when I modified it to try to allow for their swap_remap nonsense). This can be shown up very easily by simply running two memhog's of around 200MiB at the same time - OOM is the usual result, with the occasional complete system crash. Lovely..
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2011-02-18
, 16:54
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Posts: 701 |
Thanked: 585 times |
Joined on Sep 2010
@ London, England
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#56
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Originally Posted by joerg_rw
Thanks, then I guess if the driver cuts power to the slot what it does makes sense.
I mean electrical (or lowest level logical) damage caused by breaking power supply so a erase or flash cycle gets aborted. (possible) Result: card defect, bin it.
/j
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2011-02-18
, 17:29
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Posts: 284 |
Thanked: 320 times |
Joined on May 2010
@ Peterborough, UK
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#57
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By the way, I meant to mention but didn't have much time to post; there is also an anti-stalling I/O patch which I successfully compiled into the BFS kernel - it's on the garage page now, although disabled by default:
https://garage.maemo.org/tracker/ind...1528&atid=5523
It should also be trivial to patch into kernel-power, if anyone is so inclined..
https://garage.maemo.org/tracker/ind...1528&atid=5523
It should also be trivial to patch into kernel-power, if anyone is so inclined..
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2011-02-18
, 17:49
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Posts: 310 |
Thanked: 383 times |
Joined on Jan 2010
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#58
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Originally Posted by Tigerite
Just out of curiosity, have you tried running that memhog test with more min_free_kbytes?
Not sure on the SLUB/SLAB/SLOB/SLQB argument, but ramzez is basically just a port of compcache. I've tried to incorporate it into the BFS kernel, but Nokia screwed around so much with the swapping code (to try to align pages) that unfortunately it's unstable, especially with the swap notify patch (even when I modified it to try to allow for their swap_remap nonsense). This can be shown up very easily by simply running two memhog's of around 200MiB at the same time - OOM is the usual result, with the occasional complete system crash. Lovely..
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2011-02-18
, 22:36
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Moderator |
Posts: 7,109 |
Thanked: 8,820 times |
Joined on Oct 2007
@ Vancouver, BC, Canada
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#59
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Originally Posted by nightfire
Yeah me too. Still would like to figure out a way to throw it all onto a bigger display, somehow...
Thanks akpoff..
Honestly my dream is to have a true laptop in my pocket with zero artificial limitations. I want to be able to travel anywhere with nothing more than a bluetooth keyboard and mouse.
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Please don't send me a private message, post to the appropriate thread.
Thank you all for your donations!
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2011-02-19
, 03:30
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Banned |
Posts: 358 |
Thanked: 160 times |
Joined on Dec 2010
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#60
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I've tried this:
echo 4 > /sys/block/mmcblk0/queue/nr_requests
echo 200 > /proc/sys/vm/vfs_cache_pressure
from ur setting and it seems to me an improvment.
before i did this:
echo 4000 > /sys/block/mmcblk0/queue/nr_requests.
But I have this
echo 1250 > /proc/sys/vm/dirty_writeback_centisecs
echo 1250 > /proc/sys/vm/dirty_expire_centisecs
and
usr/bin/read-ahead /dev/mmcblk0p1 4000
and also i enabled
echo 1 > /proc/sys/kernel/sched_compat_yield
which i found a huge improvement.
I have compiled read-ahead myself. what do u think? did u tried my tools? did u ran bonnie++ before and after ur optimization? i did but i forgot the result. Anyway thank u for sharing i got a hard time with this device!
Last edited by epitaph; 2011-02-19 at 03:56.
echo 4 > /sys/block/mmcblk0/queue/nr_requests
echo 200 > /proc/sys/vm/vfs_cache_pressure
from ur setting and it seems to me an improvment.
before i did this:
echo 4000 > /sys/block/mmcblk0/queue/nr_requests.
But I have this
echo 1250 > /proc/sys/vm/dirty_writeback_centisecs
echo 1250 > /proc/sys/vm/dirty_expire_centisecs
and
usr/bin/read-ahead /dev/mmcblk0p1 4000
and also i enabled
echo 1 > /proc/sys/kernel/sched_compat_yield
which i found a huge improvement.
I have compiled read-ahead myself. what do u think? did u tried my tools? did u ran bonnie++ before and after ur optimization? i did but i forgot the result. Anyway thank u for sharing i got a hard time with this device!
Last edited by epitaph; 2011-02-19 at 03:56.