If your considering a new compression algorithm, I would strongly suggest
looking at lz4:-
https://code.google.com/p/lz4/
Regards
Steve
----- Original Message -----
From: "Fletcher Dunn" <fletch...@valvesoftware.com>
To: "Half-Life dedicated Win32 server mailing list"
<hlds@list.valvesoftware.com>
Sent: Wednesday, May 15, 2013 5:51 PM
Subject: Re: [hlds] Who do we send netspike.txt log too?
These are temporary measures to help diagnose and workaround the problem.
Once we confirm that this is the issue, we'll switch to Snappy or some other fast compression library. Our own hand-rolled LZSS
compressor is known to be slow.
From: hlds-boun...@list.valvesoftware.com
[mailto:hlds-boun...@list.valvesoftware.com] On Behalf Of D Bauhmz
Sent: Wednesday, May 15, 2013 9:51 AM
To: Half-Life dedicated Win32 server mailing list
Subject: Re: [hlds] Who do we send netspike.txt log too?
I forgot to ask you Fletcher.
Will sv_compressfragments and sv_compressstringtablebaselines serve as a permanent fix for this issue or is there more
optimizations and a different fix for this on the way? Are player spawns causing a spike (Which I've always thought was normal,
heh) something that is planned to be fixed/optimized as well?
Thanks
On Wed, May 15, 2013 at 12:24 PM, Fletcher Dunn
<fletch...@valvesoftware.com<mailto:fletch...@valvesoftware.com>> wrote:
No need to send any netspike files. We have enough good data and further netspike files or vprof files are not likely to help
right now. It anybody wants to send in more windows traces, however, feel free to do so.
For some reason the servers are spending huge amounts of time in compression code. The data from the traces and vprof is very
consistent. Specifically, compressing string tables and fragments can sometimes take a very large amount of time. The LZSS
compression code has not changed in ages. The contents of the string tables, as far as I can tell, did not change significantly
in the SteamPipe update. I am still at a loss to explain what changed in the SteamPipe update.
There are also occasionally mini-spikes when a player spawns, but I don't think
that's new.
I have a new "prerelease" beta that adds two convars that can be used to
totally disable compression:
sv_compressfragments - defaults ON (existing behavior to try to compress all
fragments by default)
sv_compressstringtablebaselines - default OFF (new beahvior to turn off
compression by default)
You can switch these at any time, but sv_compressfragments is "sticky" --- it takes effect on a per-client basis, at the time when
a client connects.
You might try turning both of those off and see how performance changes or if any problems occur. Of course, this will increase
bandwidth. But it would help to confirm that this is indeed the problem.
If anybody wants to do their own data gathering to see where the time is going, without the data gathering itself causing spikes
that might not have otherwise occurred, I'd recommend the following netspike / vprof settings:
vprof_on
vprof_dump_spikes 20
sv_netspike 0
sv_netspike_sendtime_ms 2
sv_netspike_output 2
From: hlds-boun...@list.valvesoftware.com<mailto:hlds-boun...@list.valvesoftware.com>
[mailto:hlds-boun...@list.valvesoftware.com<mailto:hlds-boun...@list.valvesoftware.com>] On Behalf Of Essay Tew Phaun
Sent: Wednesday, May 15, 2013 12:15 AM
To: Half-Life dedicated Win32 server mailing list
Subject: Re: [hlds] Who do we send netspike.txt log too?
fletch...@valvesoftware.com<mailto:fletch...@valvesoftware.com> I'm not sure if they're still wanting logs or not. I think they've
kind of found where the problem is. I don't know what it would hurt though.
On Wed, May 15, 2013 at 1:59 AM, DragonLight
<ad...@ponyfortress2.com<mailto:ad...@ponyfortress2.com>> wrote:
Been catching the spikes with the new commands, should we email them to someone?
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