Sorry for the multiple posts, am thinking about this problem
in between working on other stuff... and stuff comes up.
But bottom line -- I would look at the source of coreutils "dd" program
and find out how they do direct I/O. I know they had to deal with
alignment issues when the Linux kernel b
In thinking about this some more, you probably
want to limit your O_DIRECT to just opens on files --
not sockets.
I think that might be the cause of the error I got.
The other stuff may still apply, but may be OS dependent.
It doesn't look like it is real easy to tell in the
open routine where
On Mon, 18 Feb 2013, Linda Walsh wrote:
Hi dag, I really appreciate your working on this,
but it is really annoying hard and tedious.
_I_ am not certain about all the requirements of Direct I/O,
I.e. would have to research (goog/kernel source...etc).
It may be different on different platforms
Hi dag, I really appreciate your working on this,
but it is really annoying hard and tedious.
_I_ am not certain about all the requirements of Direct I/O,
I.e. would have to research (goog/kernel source...etc).
It may be different on different platforms, I _vaguely_ remember
'talking'(email) wi
On Sat, 16 Feb 2013, Linda Walsh wrote:
I wondered about that as well -- could speed things
up by 30% over going through the slow linux buffers.
One thing that the 'dd' people found out though was
that if you do direct I/O, memory and your I/O really
do have to line up -- it may be that only 51
On Sat, 16 Feb 2013, Linda Walsh wrote:
Dag Wieers wrote:
On Thu, 14 Feb 2013, Brian K. White wrote:
> On 2/14/2013 9:50 AM, Dag Wieers wrote:
>
> > Since a --direct-io feature was requested a few times the past decade
> > with little response and the actual patch is quite trivial, I p
Dag Wieers wrote:
Hi,
Since a --direct-io feature was requested a few times the past decade
with little response and the actual patch is quite trivial, I patched
both v3.0.9 and master branch and included the patches here.
Sigh.
It hasn't been done because it isn't tri
Dag Wieers wrote:
On Thu, 14 Feb 2013, Brian K. White wrote:
On 2/14/2013 9:50 AM, Dag Wieers wrote:
Since a --direct-io feature was requested a few times the past decade
with little response and the actual patch is quite trivial, I patched
both v3.0.9 and master branch and included the
I wondered about that as well -- could speed things
up by 30% over going through the slow linux buffers.
One thing that the 'dd' people found out though was
that if you do direct I/O, memory and your I/O really
do have to line up -- it may be that only 512 byte alignment
is necessary (or 4096 on
On 2/14/2013 5:21 PM, Dag Wieers wrote:
On Thu, 14 Feb 2013, Brian K. White wrote:
On 2/14/2013 9:50 AM, Dag Wieers wrote:
Since a --direct-io feature was requested a few times the past decade
with little response and the actual patch is quite trivial, I patched
both v3.0.9 and master bran
On 02/14/2013 02:21 PM, Dag Wieers wrote:
On Thu, 14 Feb 2013, Brian K. White wrote:
On 2/14/2013 9:50 AM, Dag Wieers wrote:
Since a --direct-io feature was requested a few times the past decade
with little response and the actual patch is quite trivial, I patched
both v3.0.9 and master b
On Thu, 14 Feb 2013, Brian K. White wrote:
On 2/14/2013 9:50 AM, Dag Wieers wrote:
Since a --direct-io feature was requested a few times the past decade
with little response and the actual patch is quite trivial, I patched
both v3.0.9 and master branch and included the patches here.
When
On 2/14/2013 9:50 AM, Dag Wieers wrote:
Hi,
Since a --direct-io feature was requested a few times the past decade
with little response and the actual patch is quite trivial, I patched
both v3.0.9 and master branch and included the patches here.
If this functionality is acceptable I don't mind s
Hi,
Since a --direct-io feature was requested a few times the past decade with
little response and the actual patch is quite trivial, I patched both
v3.0.9 and master branch and included the patches here.
If this functionality is acceptable I don't mind spending the additional
effort to upda
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