Dear all,
I did some performance tests that made me really wonder:
My Hardware:
Asus P5LD2 board with Intel i945P chipset, ICH7R southbridge
CPU Intel Core 2 Duo E6300 at 1.86 GHz, 2 MB Cache
1 GB RAM
My Software:
OpenSuSE 10.2 with Linux kernel 2.6.18, x86-64 architecture
FreeBSD 6.2
Am Montag, 12. Februar 2007 18:04 schrieb Andi Kleen:
Martin A. Fink [EMAIL PROTECTED] writes:
What I did:
I wrote blocks of 1 MB size to file. Each 1 GB I made a fsync and took the
time. For those tests with filesystems I wrote files of 1 GB size,
otherwise
I just wrote to the raw
System Details:
dmesg: (parts)
Bootdata ok (command line is root=/dev/sda7 vga=0x31aresume=/dev/sda5
splash=silent)
Linux version 2.6.18.2-34-default ([EMAIL PROTECTED]) (gcc version 4.1.2
20061115 (prerelease) (SUSE Linux)) #1 SMP Mon Nov 27 11:46:27 UTC 2006
...
Using ACPI (MADT) for SMP
Am Montag, 12. Februar 2007 19:41 schrieben Sie:
Martin A. Fink [EMAIL PROTECTED] writes:
Your mailer seems to be broken. It drops cc.
If you call fsync in BSD then you get what you expect. anything that is
still
not on disk will be written. Afterwards fsync returns... So this should
Am Dienstag, 13. Februar 2007 00:31 schrieben Sie:
Martin A. Fink wrote:
I have to store big amounts of data coming from 2 digital cameras to disk.
Thus I have to write blocks of around 1 MB at 30 to 50 frames per second
for
a long period of time. So it is important for me
Am Montag, 12. Februar 2007 20:08 schrieben Sie:
On Mon, 12 Feb 2007 18:56:29 +0100
Martin A. Fink [EMAIL PROTECTED] wrote:
I have to store big amounts of data coming from 2 digital cameras to disk.
Thus I have to write blocks of around 1 MB at 30 to 50 frames per second
for
a long
Am Dienstag, 13. Februar 2007 11:16 schrieben Sie:
Martin A. Fink wrote:
Am Dienstag, 13. Februar 2007 00:31 schrieben Sie:
Martin A. Fink wrote:
I have to store big amounts of data coming from 2 digital cameras to
disk.
Thus I have to write blocks of around 1 MB at 30 to 50 frames per
of data: you are right, ext2 performs better than ext3.
And ext3 in writeback mode ought in theory (but practice is always
harder ;)) be faster than ext2.
--
Dipl. Physiker
Martin Anton Fink
Max Planck Institute for extraterrestrial Physics
Giessenbachstrasse
85741 Garching
Germany
Tel. +49-(0
Am Dienstag, 13. Februar 2007 13:24 schrieben Sie:
Martin A. Fink wrote:
Also you have skipped the information how the images arrive on the
system
(PCI(e) card?), that may be important for an end to end view of the
problem.
Images arrive via Gigabit Ethernet. GigE Vision standard
Dear all,
now I installed oprofile as suggested, and very interesting things happend:
System: OpenSuSE 10.2 with AHCI on, disk: Solid State Disk (Flash Disk)
Test: Write blocks of 1MB. Do fsync() every 1GB. Measure time for each GB.
before installation of oprofile:
test
Dear Alan,
You wrote
The PIIX interface needs CPU intervention each command, so in practice
about every 64K or so, and the CPU gets stalled waiting for the disk
during the setup of each I/O. The newer kernels support AHCI which does
not have this overhead, but it is only present on the newest
Dear all,
now I was able to do a performance test with an Intel ICH6R chipset.
Basic hardware data:
- Intel Pentium 4 Xeon at 3.2 GHz
- Intel ICH6R chipset, AHCI enabled
- Intel Hyperthreading On and Off
- 1 GB SDDR RAM
- SATA controller onboard (4x)
- SATA harddisks 250 GB
I used SuSE Linux
Dear all,
now I was able to do a performance test with an Intel ICH6R chipset.
Basic hardware data:
- Intel Pentium 4 Xeon at 3.2 GHz
- Intel ICH6R chipset, AHCI enabled
- Intel Hyperthreading On and Off
- 1 GB SDDR RAM
- SATA controller onboard (4x)
- SATA harddisks 250 GB
I used SuSE Linux
Dear Alan,
You wrote
> The PIIX interface needs CPU intervention each command, so in practice
> about every 64K or so, and the CPU gets stalled waiting for the disk
> during the setup of each I/O. The newer kernels support AHCI which does
> not have this overhead, but it is only present on the
Dear all,
now I installed oprofile as suggested, and very interesting things happend:
System: OpenSuSE 10.2 with AHCI on, disk: Solid State Disk (Flash Disk)
Test: Write blocks of 1MB. Do fsync() every 1GB. Measure time for each GB.
before installation of oprofile:
test
Dear all,
I did some performance tests that made me really wonder:
My Hardware:
Asus P5LD2 board with Intel i945P chipset, ICH7R southbridge
CPU Intel Core 2 Duo E6300 at 1.86 GHz, 2 MB Cache
1 GB RAM
My Software:
OpenSuSE 10.2 with Linux kernel 2.6.18, x86-64 architecture
FreeBSD 6.2
Am Montag, 12. Februar 2007 18:04 schrieb Andi Kleen:
> "Martin A. Fink" <[EMAIL PROTECTED]> writes:
> >
> > What I did:
> > I wrote blocks of 1 MB size to file. Each 1 GB I made a fsync and took the
> > time. For those tests with filesystems I wrote
Some more info:
:~> strace -c -T -o trace.out dd if=/dev/zero of=test.txt bs=10MB count=200
200+0 Datensätze ein
200+0 Datensätze aus
20 bytes (2,0 GB) copied, 52,8632 seconds, 37,8 MB/s
test.txt:
% time seconds usecs/call callserrors syscall
-- --- ---
System Details:
dmesg: (parts)
Bootdata ok (command line is root=/dev/sda7 vga=0x31aresume=/dev/sda5
splash=silent)
Linux version 2.6.18.2-34-default ([EMAIL PROTECTED]) (gcc version 4.1.2
20061115 (prerelease) (SUSE Linux)) #1 SMP Mon Nov 27 11:46:27 UTC 2006
...
Using ACPI (MADT) for SMP
Am Montag, 12. Februar 2007 19:41 schrieben Sie:
> "Martin A. Fink" <[EMAIL PROTECTED]> writes:
>
> Your mailer seems to be broken. It drops cc.
> >
> > If you call fsync in BSD then you get what you expect. anything that is
still
> > not on disk will
Am Dienstag, 13. Februar 2007 00:31 schrieben Sie:
> Martin A. Fink wrote:
> > I have to store big amounts of data coming from 2 digital cameras to disk.
> > Thus I have to write blocks of around 1 MB at 30 to 50 frames per second
for
> > a long period of time. So i
Am Montag, 12. Februar 2007 20:08 schrieben Sie:
> On Mon, 12 Feb 2007 18:56:29 +0100
> "Martin A. Fink" <[EMAIL PROTECTED]> wrote:
>
> > I have to store big amounts of data coming from 2 digital cameras to disk.
> > Thus I have to write blocks of arou
Am Dienstag, 13. Februar 2007 11:16 schrieben Sie:
> Martin A. Fink wrote:
> > Am Dienstag, 13. Februar 2007 00:31 schrieben Sie:
> >> Martin A. Fink wrote:
> >>> I have to store big amounts of data coming from 2 digital cameras to
disk.
> >>> Thus I
A-1 itself may not be the decider but something else -
> eg the hard disk using NCQ, which would cover up any latency related
> problems.
>
> > Journaling of data: you are right, ext2 performs better than ext3.
>
> And ext3 in writeback mode ought in theory (but practice
Am Dienstag, 13. Februar 2007 13:24 schrieben Sie:
> Martin A. Fink wrote:
>
> >> Also you have skipped the information how the images "arrive" on the
system
> > (PCI(e) card?), that may be important for an "end to end" view of the
> > problem.
&g
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