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

[Rémi Denis-Courmont]

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.
>
>> 
>> -- 
>> 雷米‧德尼-库尔蒙
>> http://www.remlab.net/
>> 
>> 
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