infectormp

Have same problem, using Exchange.

Sent mail view from N1 and Outlook 

kernel 4.9 was added to longterm supported kernels https://lkml.org/lkml/2017/1/19/339

from https://man7.org/linux/man-pages/man2/readv.2.html > preadv2() and pwritev2() first appeared in Linux 4.6. Library support was added in glibc 2.26.

@ThomasWaldmann look like `RWF_UNCACHED` flag was introduced in [kenel 5.5 ](https://sjp38.github.io/post/lkml_news_v5.5-rc2/)

hmm... i check latest kernel source and do not find any string with `RWF_UNCACHED`. So look like this work unfinished yet.

Yet another work that can help speedup walk through files https://lwn.net/Articles/843163/

@ThomasWaldmann Sorry, I don't know how borg can use this. This is just for information, maybe someone can find how to use it in the future.

Hash news from [Google ](http://google-opensource.blogspot.ru/2016/03/new-algorithms-may-lower-cost-of-secure.html) : - siphash - highwayhash

Dupe of https://github.com/borgbackup/borg/issues/4754?