--- On Thu, 3/31/11, Arnd Bergmann <a...@arndb.de> wrote:
> From: Arnd Bergmann <a...@arndb.de> > Subject: Re: ext2/3/4 group size > To: devel@lists.laptop.org > Cc: "Yioryos Asprobounitis" <mavrot...@yahoo.com> > Date: Thursday, March 31, 2011, 3:34 AM > On Thursday 31 March 2011 08:45:24 > Yioryos Asprobounitis wrote: > > > > I was wondering if it makes any sense when making an > ext fs on an SDcard > > to try to align the erase block of the card with the > ext2 group size. > > eg assuming a card with a 4KB pages and 4MB erase > blocks, try something > > like `mkfs.ext3 -b 4096 -g 1024' > > Could it offer any speed advantage in garbage > collection or just tax the > > file system with the keep-up of 1000 groups (for a 4GB > card)? > > (If I got it all wrong, please explain :-) > > In theory, it should help to do this, and I've had the same > idea. However, > I haven't seen anyone back it up with numbers, and it may > as well have > the opposite effect because of something I haven't thought > of. > > What kind of card do you use specifically? I have a very good 2-year old 4GB class 6 Transcend a poor 1-year old 4BG class 6 Kingsoton and terrible 2-year old 8GB A-data Rating is based on iozone data and "terrible" means that I get file corruption quite often. Kingston is just slow. None of them is formatted as suggested. > > Arnd > _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel