On 11/18/07, Mark Lord [EMAIL PROTECTED] wrote:
Fajun Chen wrote:
On 11/17/07, Mark Lord [EMAIL PROTECTED] wrote:
..
What you probably intended to do instead, was to use mmap to just allocate
some page-aligned RAM, not to actually mmap'd any on-disk data. Right?
Here's how that's done
On 11/18/07, Mark Lord [EMAIL PROTECTED] wrote:
Fajun Chen wrote:
..
I verified your program works in my system and my application works as
well if changed accordingly. However, this change (indirect IO in sg
term) may come at a performance cost for IO intensive applications
since
On 11/17/07, Mark Lord [EMAIL PROTECTED] wrote:
Fajun Chen wrote:
On 11/16/07, Mark Lord [EMAIL PROTECTED] wrote:
Fajun Chen wrote:
Hi All,
I use sg/libata and ata pass through for read/writes. Linux 2.6.18-rc2
and libata version 2.00 are loaded on ARM XScale board. Under heavy
cpu
On 11/17/07, James Chapman [EMAIL PROTECTED] wrote:
Fajun Chen wrote:
On 11/16/07, Tejun Heo [EMAIL PROTECTED] wrote:
Fajun Chen wrote:
I use sg/libata and ata pass through for read/writes. Linux 2.6.18-rc2
and libata version 2.00 are loaded on ARM XScale board. Under heavy
cpu load
On 11/17/07, Mark Lord [EMAIL PROTECTED] wrote:
Fajun Chen wrote:
On 11/17/07, Mark Lord [EMAIL PROTECTED] wrote:
Fajun Chen wrote:
On 11/16/07, Mark Lord [EMAIL PROTECTED] wrote:
Fajun Chen wrote:
..
This problem also happens with R/W DMA ops. Below are simplified code
snippets
Hi All,
I use sg/libata and ata pass through for read/writes. Linux 2.6.18-rc2
and libata version 2.00 are loaded on ARM XScale board. Under heavy
cpu load (e.g. when blocks per transfer/sector count is set to 1),
I've observed that the test application can suck cpu away for long
time (more than
Hi All,
The command duration is measured in sg.c using
jiffies_to_msecs(jiffies). The HZ set up in my ARM system is 100, so
this time measurement can only provide resolution of 10ms (or +/-
5ms). Since the AT commands in sequential read mode can be as fast as
about 1ms, this inaccuracy could
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