Michael Stiller wrote:
Hi list,
i'm developing an application (in C) which needs to write about
1Gbit/s (125Mb/s) to a disk array attached via U320 SCSI.
It runs on Dual Core 2 Xeons @2Ghz utilizing kernel 2.6.22.7.
People regularly report speeds higher than that on the RAID list, and I
Michael Stiller wrote:
Hi list,
i'm developing an application (in C) which needs to write about
1Gbit/s (125Mb/s) to a disk array attached via U320 SCSI.
It runs on Dual Core 2 Xeons @2Ghz utilizing kernel 2.6.22.7.
People regularly report speeds higher than that on the RAID list, and I
On Tue, 2007-10-09 at 16:56 +0200, Andi Kleen wrote:
> Michael Stiller <[EMAIL PROTECTED]> writes:
> >
> > The write(2) performance is not good enough, the writer threads take to
> > much time, and i ask you for ideas, howto to boost the write
> > performance.
>
> You could use an O_DIRECT
On Tue, 2007-10-09 at 16:56 +0200, Andi Kleen wrote:
Michael Stiller [EMAIL PROTECTED] writes:
The write(2) performance is not good enough, the writer threads take to
much time, and i ask you for ideas, howto to boost the write
performance.
You could use an O_DIRECT write if the data
>
> The kernel really cannot sustain 125MB/s? I assume the disk
> array is capable?
Yes, the array should be capable, LSI controller U320, SATA disks inside
the array.
> Where is the bottleneck? Does it keep all disks busy, or are
> the CPUs overloaded?
I'm not sure where the bottleneck is.
The kernel really cannot sustain 125MB/s? I assume the disk
array is capable?
Yes, the array should be capable, LSI controller U320, SATA disks inside
the array.
Where is the bottleneck? Does it keep all disks busy, or are
the CPUs overloaded?
I'm not sure where the bottleneck is. CPU
On Tuesday 09 October 2007 23:50, Michael Stiller wrote:
> Hi list,
>
> i'm developing an application (in C) which needs to write about
> 1Gbit/s (125Mb/s) to a disk array attached via U320 SCSI.
> It runs on Dual Core 2 Xeons @2Ghz utilizing kernel 2.6.22.7.
>
> I buffer the data in (currently 4)
Boaz Harrosh wrote:
[]
> If your target is a SCSI target you can gain up to 15% by using
> sg. Search on the net for the "sg utils" package. The source code
> of sg_dd and others are a grate example of how to do it.
>
> Other wise O_DIRECT is your friend. Also look for asynchronous
> I/O so you
On Tue, Oct 09 2007 at 16:56 +0200, Andi Kleen <[EMAIL PROTECTED]> wrote:
> Michael Stiller <[EMAIL PROTECTED]> writes:
>> The write(2) performance is not good enough, the writer threads take to
>> much time, and i ask you for ideas, howto to boost the write
>> performance.
>
> You could use an
Michael Stiller <[EMAIL PROTECTED]> writes:
>
> The write(2) performance is not good enough, the writer threads take to
> much time, and i ask you for ideas, howto to boost the write
> performance.
You could use an O_DIRECT write if the data is suitably aligned
and your IO sizes are big enough
El Tue, 09 Oct 2007 15:50:17 +0200
Michael Stiller <[EMAIL PROTECTED]> escribió:
> Hi list,
>
> i'm developing an application (in C) which needs to write about
> 1Gbit/s (125Mb/s) to a disk array attached via U320 SCSI.
> It runs on Dual Core 2 Xeons @2Ghz utilizing kernel 2.6.22.7.
>
> I
Hi list,
i'm developing an application (in C) which needs to write about
1Gbit/s (125Mb/s) to a disk array attached via U320 SCSI.
It runs on Dual Core 2 Xeons @2Ghz utilizing kernel 2.6.22.7.
I buffer the data in (currently 4) 400Mb buffers and use write(2) in a
dedicated thread to write
Hi list,
i'm developing an application (in C) which needs to write about
1Gbit/s (125Mb/s) to a disk array attached via U320 SCSI.
It runs on Dual Core 2 Xeons @2Ghz utilizing kernel 2.6.22.7.
I buffer the data in (currently 4) 400Mb buffers and use write(2) in a
dedicated thread to write
El Tue, 09 Oct 2007 15:50:17 +0200
Michael Stiller [EMAIL PROTECTED] escribió:
Hi list,
i'm developing an application (in C) which needs to write about
1Gbit/s (125Mb/s) to a disk array attached via U320 SCSI.
It runs on Dual Core 2 Xeons @2Ghz utilizing kernel 2.6.22.7.
I buffer the
Michael Stiller [EMAIL PROTECTED] writes:
The write(2) performance is not good enough, the writer threads take to
much time, and i ask you for ideas, howto to boost the write
performance.
You could use an O_DIRECT write if the data is suitably aligned
and your IO sizes are big enough
On Tue, Oct 09 2007 at 16:56 +0200, Andi Kleen [EMAIL PROTECTED] wrote:
Michael Stiller [EMAIL PROTECTED] writes:
The write(2) performance is not good enough, the writer threads take to
much time, and i ask you for ideas, howto to boost the write
performance.
You could use an O_DIRECT
Boaz Harrosh wrote:
[]
If your target is a SCSI target you can gain up to 15% by using
sg. Search on the net for the sg utils package. The source code
of sg_dd and others are a grate example of how to do it.
Other wise O_DIRECT is your friend. Also look for asynchronous
I/O so you have a
On Tuesday 09 October 2007 23:50, Michael Stiller wrote:
Hi list,
i'm developing an application (in C) which needs to write about
1Gbit/s (125Mb/s) to a disk array attached via U320 SCSI.
It runs on Dual Core 2 Xeons @2Ghz utilizing kernel 2.6.22.7.
I buffer the data in (currently 4) 400Mb
18 matches
Mail list logo
