[kio] [Bug 291835] KIO very slow when copying from network through fish

[Julian Kalinowski]

https://bugs.kde.org/show_bug.cgi?id=291835

--- Comment #31 from Julian Kalinowski <julakali at gmail.com> ---
Well, i just checked your commit again. It doubles the transfer speed in my
case, which is nice.
The increased buffer size wasn't mentioned in the comment, so i guess nobody
saw it.

However, using cifs, transfer speed is still twice as high as using kio-smb
with the 64k buffer size, because it requests more data before a reply comes in
(async read-ahead, i think it's in file.c: cifs_readpages).
And for some reason, the kio-slave does that too if buffer size is increased
above the 64k, thats why a buffer size of 1048576 works better, even if the
transferred packets are only allowed to be 64k.

So beyond buffer size increase (which is nice!), read-ahead would be useful to
reduce waiting time.

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