Check this: http://lkml.org/lkml/2007/10/4/50 http://lkml.org/lkml/2007/6/20/238 http://lkml.org/lkml/2006/9/8/4 blocksize and pagesize always have to match for optimum performance, so max size for blocksize is pagesize. not sure why u want to have large blocksize....check this: http://lkml.indiana.edu/hypermail/linux/kernel/0510.2/0513.html even if u want to update ONE byte....u have to lock the entire blocksize....moreover...blocksize also affect application performance (Oracle): http://forums13.itrc.hp.com/service/forums/questionanswer.do?admit=109447627+1252466541647+28353475&threadId=1304351 so fundamentally, why the link between pagesize and blocksize? well.....virtual memory operation is always physically contiguous at the PAGESIZE level....so hardware wise there is no discontinuity when u do a copy. but then there exists something called scatter-gather I/O APIs...allowing multiple discontinous range of physical I/O operation.....no knowledge of that....perhaps someone can comment? On Fri, Sep 4, 2009 at 8:59 PM, Rishi Agrawal<rishi.b.agrawal@xxxxxxxxx> wrote: > Hello All, > > I found this paragraph while understanding file systems. > > " > I assume that you are setting this up with ext3 and hence my answer ties to > this. If your filesystem is different, you should say so. > > Note: *In ext3, an 8K block size on the fs is only possible if you use > Itanium and other 8K architectures. If your architecture is x86, x86_64, it > is not possible to have a block size greater than 4k*. If you try to make an > ext3 fs you will fail with an error message similar to this: > > mkfs.ext3: 8192-byte blocks too big for system (max 4096) > > So,if your server architecture can take it, you can > i)use parted post installation to make the partition and then type the > following example (if your partition is called for instance /dev/sda2): > > mkfs -t ext3 -b 8192 /dev/sda2 > " > link : http://osdir.com/ml/redhat-list/2009-06/msg00131.html > > > I could not figure out the dependency between the file system block size and > the architecture. > > Can somebody guide me in this ? > > > > > -- > Regards, > Rishi B. Agrawal > http://www.linkedin.com/in/rishibagrawal > http://code.google.com/p/fscops/ > -- Regards, Peter Teoh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
