ael via Dng wrote:
> Isn't conv=sync needed to make sure that you are not just seeing buffer
> effects?
Better oflags=sync,direct rather than conv=sync though both are
similar in result.
Bob
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Dng mailing lis
Speed tests on cached filesystems don't do what is expected. The kernel
will write into RAM as much as it can, and leave the actual I/O for later.
On Thu, Jun 23, 2022 at 12:39 PM Jakub Juszczakiewicz via Dng <
dng@lists.dyne.org> wrote:
> Hi list,
>
> What is time between call dd? On ext fi
Hi list,
What is time between call dd? On ext filesystems is implemented
delay before physically write date on disk. It's for e.g. minimally
files fragmentation. Second question is that, did you try call "sync"
command after each of writes?
---
Best regards,
Jakub Juszczakiewicz
Krypto-I
On Thursday 23 June 2022 at 15:41:21, Dr. Nikolaus Klepp via Dng wrote:
> This does not make sense to me:
> > >> dd if=/dev/zero of=xx bs=1G count=1
> > >>
> > >> reports 2.6 GB (expected)
>
> IMO ~ 1GB is expected, not 2.6:
>
> $ dd if=/dev/zero of=xx bs=1G count=1
> 1+0 Datensätze ein
> 1+0 D
On Thu, Jun 23, 2022 at 03:41:21PM +0200, Dr. Nikolaus Klepp via Dng wrote:
> > >>
> > >> when i write to a disk:
> > >> dd if=/dev/zero of=xx bs=1G count=1
> > >>
> > >> reports 2.6 GB (expected)
> > >> doing again speed drops to 200MB.
Isn't conv=sync needed to make sure that you are not just se
This does not make sense to me:
> >> dd if=/dev/zero of=xx bs=1G count=1
> >>
> >> reports 2.6 GB (expected)
IMO ~ 1GB is expected, not 2.6:
$ dd if=/dev/zero of=xx bs=1G count=1
1+0 Datensätze ein
1+0 Datensätze aus
1073741824 Bytes (1,1 GB, 1,0 GiB) kopiert, 0,617959 s, 1,7 GB/s
Nik
Anno domin
Its a normal HD i guess 4096 is ok,
but i do not think that this matters.
Am 23.06.22 um 13:11 schrieb Rich W:
Hi,
A blocksize of 1G seems extreme.
What is the optimal blocksize of the output device?
Cheers,
-Rich
On Thu, Jun 23, 2022, 4:52 AM Radisson via Dng wrote:
Hi list,
i found a s
Hi,
A blocksize of 1G seems extreme.
What is the optimal blocksize of the output device?
Cheers,
-Rich
On Thu, Jun 23, 2022, 4:52 AM Radisson via Dng wrote:
> Hi list,
> i found a strange ext4 (?) effect.
>
> when i write to a disk:
> dd if=/dev/zero of=xx bs=1G count=1
>
> reports 2.6 GB (ex
Hi list,
i found a strange ext4 (?) effect.
when i write to a disk:
dd if=/dev/zero of=xx bs=1G count=1
reports 2.6 GB (expected)
doing again speed drops to 200MB.
removing xx restores old speed.
I ask the net and it seems that the effect is there
since kernel 2.6. I found the explainations a
