[vlc-devel] [PATCH] smb2: limit the read size

[Alexandre Janniaux]

Hi,

Cannot we just have a control to ask RTT to the access or
have a way to measure the time to first read / time to first
read after seek otherwise, if it only depends on this value?

Regards,
--
Alexandre Janniaux
Videolabs

On Fri, Feb 07, 2020 at 06:47:28PM +0100, Thomas Guillem wrote:
> I guess most local network access have a fast round-trip time. So we could enable FAST SEEK for them.
>
> For now, 256kb seems to be a good compromise, and safer than enabling fast seek.
>
> On Fri, Feb 7, 2020, at 16:48, Rémi Denis-Courmont wrote:
> > Hi,
> >
> > Fast seeking depends on round-trip time (a.k.a. "ping"), not bandwidth, so the answer is that "it depends".
> >
> > Le 7 février 2020 12:11:11 GMT+02:00, Thomas Guillem <thomas at gllm.fr> a écrit :
> >>
> >>
> >> On Thu, Feb 6, 2020, at 17:57, Rémi Denis-Courmont wrote:
> >>> Le torstaina 6. helmikuuta 2020, 17.29.54 EET Thomas Guillem a écrit :
> >>>> This fixes slow probing/seeking when using prefetch since it requests big
> >>>> data size (16MB) for each read().
> >>> The impact of read size on effective stream bandwidth is roughly hyperbolic.
> >>> Existing Trac report show that 32 KiB is far too little in real life:
> >>> https://trac.videolan.org/vlc/ticket/19988#comment:15
> >>
> >> I missed that comment, thanks for you input.
> >> So the faster you are, the less responsive (to seek) you are.
> >>
> >> I think I will go between 128k and 1024k. I will do some test at home with my poor wifi setup.
> >>
> >> What about your comment "Marking CIFS as fast-seekable".
> >>
> >> CIFS is 99% local network (except those using it via ssh/port redirect).
> >> So it should be fast, but lot of people have a bad wifi setup (like me), it's not uncommon to only have 800kb/s (bad router + lot of wifi neighbors in a city).
> >>
> >> Is 800kb/s fast enough to enable fast-seekable ?
> >>
> >> Crazy idea: live switch between the 2 cache modules depending on the I/O speed.
> >>
> >> >
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