Re: [9fans] dd(1) takes very long

[Steve simon <steve@quintile.net>]

A larger block size as lucio says, and also try two dd's with a pipe between them,
one reading and one writing. dd(1) is single threaded but you have two asynchronous physical devices.

I have had good success copying sd-cards using fcp -  rsc's  multithreaded cp, already in the distribution,
though I don't know what blocksize it uses offhand.

-Steve

> On 1 Mar 2024, at 09:39, Lucio De Re <lucio.dere@gmail.com> wrote:
> 
> Increasing the dd block size (-bs 1024k or as big as the man pages
> allow) could make a big difference.
> 
> 
> On 3/1/24, Aleksandar Kuktin <ak@triklod.rs> wrote:
>>> On Fri, 1 Mar 2024 10:08:25 +0100
>>> Marco Feichtinger <marco@germteig.com> wrote:
>>> 
>>>> and the computer isn't a SBC bitty box, the transfer rate is weirdly
>>>> low.
>>> 
>>> Well, both disk are on the same machine.
>>> It's a Supermicro X7SPA-H-D525 board.
>>> 
>>> -marco
>> 
>> Well, that's not a bitty box. Wish I bought something like that instead
>> of my BananaPi. Anyway, someone more knowledgeable on Plan 9 than me is
>> needed. I can only speculate that the OS and hardware fight. I have
>> something similar happening on my desktop with modern hardware running
>> old software. I run GNU/Linux on it. For some reason I can't figure out,
>> transfers start off normal but then degrade to 10 Mbps or less after a
>> few GiB are transferred. If I try it with CentOS 7, it runs fine. But
>> when I use my own homegrown distro it's pathologic. Kernel version
>> 3.16.85, vanilla.
>> 
>> --
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>> --
>> You don't need an AI for a robot uprising.
>> Humans will do just fine.
>> --
>> 
> 
> 
> --
> Lucio De Re
> 2 Piet Retief St
> Kestell (Eastern Free State)
> 9860 South Africa
> 
> Ph.: +27 58 653 1433
> Cell: +27 83 251 5824



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