* Question on hd_geometry & blk_rq_cur_sectors
@ 2011-05-04 3:43 Vic
2011-05-04 5:24 ` Mulyadi Santosa
0 siblings, 1 reply; 2+ messages in thread
From: Vic @ 2011-05-04 3:43 UTC (permalink / raw)
To: kernelnewbies
Hi All,
I have 2 questions on creating a ramdisk driver.
How do I init the hd_geometry for my device ie to say how do I set geo
cylinders, head, sectors and size. As this is ramdisk I dont think it
matters but want to confirm.
geo->cylinders = 1;
geo->heads = 1;
geo->sectors = Device.size/logical_block_size;
geo->start = 0;
Also, with my current settings, if I use DD on my ramdisk I get
"blk_rq_cur_sectors" count to be always 8, which confuses my drive b'se I
want to only handle 512 requests at a time.
Simple command to test the disk sing DD "sudo dd if=/dev/urandom
of=/dev/sbd0 bs=512 count=1"
with bs=512 I was hoping to see only the 512 byte request
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* Question on hd_geometry & blk_rq_cur_sectors
2011-05-04 3:43 Question on hd_geometry & blk_rq_cur_sectors Vic
@ 2011-05-04 5:24 ` Mulyadi Santosa
0 siblings, 0 replies; 2+ messages in thread
From: Mulyadi Santosa @ 2011-05-04 5:24 UTC (permalink / raw)
To: kernelnewbies
On Wed, May 4, 2011 at 10:43, Vic <vic.lix10@gmail.com> wrote:
> Also, with my current settings, if I use DD on my ramdisk I get
> "blk_rq_cur_sectors" count to be always 8, which confuses my drive b'se I
> want to only handle 512 requests at a time.
> Simple command to test the disk sing DD?"sudo dd if=/dev/urandom
> of=/dev/sbd0 bs=512 count=1"
> with bs=512 I was hoping to see only the 512 byte request
read ahead setting, maybe?
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
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