Re: Problems with "Enable some performance tuning" => extremly slow downloads

[Matthias Fischer <matthias.fischer@ipfire.org>]

[-- Attachment #1: Type: text/plain, Size: 2461 bytes --]

Hi,

On 21.02.2019 10:33, Michael Tremer wrote:
> On 21 Feb 2019, at 00:36, Matthias Fischer <matthias.fischer(a)ipfire.org> wrote:
>> On 20.02.2019 16:40, Michael Tremer wrote:
>>> Interesting… These settings shouldn’t have any impact on any connections going through the firewall.

>> ...

>>> Can you narrow it down to one specific setting of these by disabling one by one?

>> Right now: definitely NO. Its "under investigation".
>> 
>> Best,
>> Matthias
>> 
>> P.S.: Oh my - it was too late for something like this - just saw it: the
>> machine needs a reboot to really get rid of the tuned parameters, right!?
> 
> No you can set these without a reboot...

It was a bit too late/early in the morning  - I overlooked the defaults.

Current results:

No problems with DoT and:
vm.swappiness = 1
net.ipv4.tcp_fastopen = 3

Testing takes a while because this "degrading" happens without prior
notice and you don't notice it during normal surfing, only while
downloading.

Best,
Matthias

> 
>> 
>>> -Michael
>>> 
>>>> On 20 Feb 2019, at 10:18, Matthias Fischer <matthias.fischer(a)ipfire.org> wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> being curious, I tested commit
>>>> https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=d03916e55851a243594ebf6f0c20c8f6d9092277
>>>> on my Core 127 / 32bit IPFire.
>>>> 
>>>> At first I didn't notice any differences, system was running as usual.
>>>> No important performance impact or change.
>>>> 
>>>> But yesterday, while starting some bigger downloads and closely
>>>> watching, I noticed that everytime someone started to download a
>>>> somewhat bigger file, e.g. 250-800 MB, downloading rates went down to a
>>>> crawl. Some downloads even aborted and nearly all where amazingly slow
>>>> (~150KB/s, normal: ~6.5 MB/s).
>>>> 
>>>> Restarting our Fritzbox and IPFire itself didn't help, all downloads
>>>> stayed that way.
>>>> 
>>>> After reverting the above commit in '/etc/sysctl.conf' and running
>>>> 'sysctl -p', system is running at full speed again: VDSL, 50Mbit down /
>>>> 10Mbit up.
>>>> 
>>>> Configuration:
>>>> Duo Box with Core 127/32bit. Running 'privoxy 3.0.28', 'squid 4.6'
>>>> (non-transparent, 512 MB RAM only), 'squidguard 1.5 beta',
>>>> 'squidclamav', 'snort / guardian', 'unbound 1.9.0' with DoT/TFO.
>>>> 
>>>> Could someone please test and confirm (or not ;-) ).
>>>> 
>>>> Best,
>>>> Matthias
>>> 
>>> 
>> 
> 
>