[Interest] Very slow write to a samba file

Etienne Sandré-Chardonnal etienne.sandre at m4x.org
Fri Mar 27 09:19:08 CET 2015


Hi Thiago,

But when it's buffered, the API waits until it has a sufficiently large
block, and then send it to the OS layer. Then it's fast. What is the block
size?

Would this mean that a large block is slower (in MB/sec) than a medium one
for the OS?

Regards

2015-03-27 0:38 GMT+01:00 Thiago Macieira <thiago.macieira at intel.com>:

> On Thursday 26 March 2015 23:42:41 Etienne Sandré-Chardonnal wrote:
> > I understand that Qt::Unbuffered will cause slow output when writing a
> lot
> > of small blocks of data, but why is it also slower when writing large
> > blocks (1MB) ?
>
> Please address that question to Microsoft.
>
> When it's unbuffered, we send every block directly to the OS layer. If 1
> MB is
> slow, it's because Microsoft made it slow...
>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
>
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