[kwlug-disc] block size for dd -- no difference

[Sandeep Johri]

Just a thought - that may be the write speed but the elapsed time to 
complete the sync may vary depending on the bs.  I have noticed that 
when trying to back-up a drive.  This is a non-tech noob comment :-)

From:
Sandeep Johri

On 2025-09-03 03:35, William Park via kwlug-disc wrote:
>
>
> On 2025-09-03 02:28, Chris Frey wrote:
>> On Tue, Sep 02, 2025 at 10:40:54PM -0400, William Park via kwlug-disc 
>> wrote:
>>> for i in {4,16,64,256}K {1,4,16,64}M; do
>>>      echo ==== $i ====
>>>      dd if=/dev/sda of=/dev/sdi bs=$i
>>>      sync
>>> done
>>>
>>> No difference.  All did 117MB/s.
>>
>> Cool test.
>>
>> What about CPU load?  What about syscall load?
>
> I didn't look for those.  I just ran it in single user mode with 
> read-only filesystem,
>     telinit 1
>     mount -o remount,ro /
>     ...
> and went to sleep. :-)
>
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