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Marek Olšák has recently sent word to the AMD mailing list that they have found a reason for some games performing poorly using Mesa. Another developer noted that a patch is already in progress.

QuoteI'm seeing random temporary freezes (up to 2 seconds) under memory
pressure. Before I describe the exact circumstances, I'd like to say
that this is a serious issue affecting playability of certain AAA
Linux games.


Marek goes on to detail how to reproduce it and suggests some workarounds.
QuoteIn order to reproduce this, an application should:
- allocate a few very large buffers (256-512 MB per buffer)
- allocate more memory than there is available VRAM. The issue also
occurs (but at a lower frequency) if the app needs only 80% of VRAM.

Example: ttm_bo_validate needs to migrate a 512 MB buffer. The total
size of moved memory for that call can be as high as 1.5 GB. This is
always followed by a big temporary drop in VRAM usage.


The good news is that another message from Christian König states they they are already working on it, and they may have something to show rather soon:
QuoteHi Marek,

I'm already working on this.

My current approach is to use a custom BO manager for VRAM with TTM and
so split allocations into chunks of 4MB.

Large BOs are still swapped out as one, but it makes it much more likely
to that you can allocate 1/2 of VRAM as one buffer.

Give me till the end of the week to finish this and then we can test if
that's sufficient or if we need to do more.

Regards,
Christian.


It's really great to see some attention to performance and not just getting their feature list up to spec. Onwards and upwards!

I've said for a long time now to heated debates that AMD drivers (both open and closed) need work on performance and that it's not purely down to game porters. It will be great if this helps certain games gain official support on AMD with Mesa in future. Article taken from GamingOnLinux.com.
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39 comments
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Liam Dawe 18 Aug, 2016
You should remember not everyone uses Linux for just freedom, there's many reasons. You should just accept others choices and move on. Not everyone needs a lecture and we don't need an AMD topic derailed because of it :)
babai 18 Aug, 2016
Quoting: liamdaweYou should remember not everyone uses Linux for just freedom, there's many reasons. You should just accept others choices and move on. Not everyone needs a lecture and we don't need an AMD topic derailed because of it :)

Sure Liam! that's why I said earlier that if you use linux for whatever other reasons, its completely fine.
Ohh and can you please benchmark some games like Mordor with the latest patches? (the one's claiming 25% improvements for bioshock infinite)
Cmdr_Iras 18 Aug, 2016
Quoting: liamdaweYou should remember not everyone uses Linux for just freedom, there's many reasons. You should just accept others choices and move on. Not everyone needs a lecture and we don't need an AMD topic derailed because of it :)

Indeed, I started using Linux just to see what it was like. When I decided to switch totally one of the choices I made was yo change my graphics card to Nvidia as I valued my gaming still.

I like that much of the O/S is open source, but I don't inherently have a problem with proprietary software so long as it doesn't impede on security and performance. I also have no problem with paying for software when it gives me something tangible in return over the alternative.
Liam Dawe 18 Aug, 2016
Quoting: babai
Quoting: liamdaweYou should remember not everyone uses Linux for just freedom, there's many reasons. You should just accept others choices and move on. Not everyone needs a lecture and we don't need an AMD topic derailed because of it :)

Sure Liam! that's why I said earlier that if you use linux for whatever other reasons, its completely fine.
Ohh and can you please benchmark some games like Mordor with the latest patches? (the one's claiming 25% improvements for bioshock infinite)
I would love to, but I don't own any AMD GPU to test with unfortunately. Until the Patreon grows bigger I can't really afford to shell out on some.
Guest 18 Aug, 2016
Quoting: liamdawe
Quoting: Purple Library GuyA custom BO manager? You mean, like, heavy-duty underarm deodorant?
Yeah the main issue is the BO problem, they are working on a spray for it.

Is that because there cards get so hot ?
libgradev 18 Aug, 2016
Quoting: liamdawe
Quoting: babai
Quoting: liamdaweYou should remember not everyone uses Linux for just freedom, there's many reasons. You should just accept others choices and move on. Not everyone needs a lecture and we don't need an AMD topic derailed because of it :)

Sure Liam! that's why I said earlier that if you use linux for whatever other reasons, its completely fine.
Ohh and can you please benchmark some games like Mordor with the latest patches? (the one's claiming 25% improvements for bioshock infinite)
I would love to, but I don't own any AMD GPU to test with unfortunately. Until the Patreon grows bigger I can't really afford to shell out on some.

I will - running an RX480 in my workstation now :)
grenadecx 18 Aug, 2016
Quoting: babaiYou tell us that you're all for freedom, and don't support a freedom friendly company... that makes you a hypocrite.

You've clearly no idea what the word hypocrite means, or freedom for that matter.

Fun fact, did I say I do not support AMD?
Liam Dawe 18 Aug, 2016
Quoting: grenadecx
Quoting: babaiYou tell us that you're all for freedom, and don't support a freedom friendly company... that makes you a hypocrite.

You've clearly no idea what the word hypocrite means, or freedom for that matter.

Fun fact, did I say I do not support AMD?
Alright, enough now, let's not derail it any more please. Continue it in the forum you if want.
manero666 18 Aug, 2016
nice nice!

I have a 5770, a 7770 and a 380 parked somewhere here at home, can't wait to return to AMD!! :)
ElectricPrism 18 Aug, 2016
All that I see going on in here is everyone getting their control boners on - don't you tell me I can't use X over Y.

Don't talk about X or Y - talk about Z.

My fellow Linux Peeps, we are a community who most of us likely has control issues, when Linus couldn't control the quality of the nVidia driver or force them into using a FOSS driver he gave them the finger.

I'm super super SUPER SUPER SUPER SUPER excited about the performance improvements of this patch, I sincerely believe that in about a year the tables between NVidia and AMD will be more or less equal 50/50 40/60 with the major difference being AMD promoting a open driver and having less bugs.

I'm very excited preparing to switch to Red Camp, I'll be TTY switching like it's 1999, and kiss goodbye to GPU buffer corruption from NVidia.

Go TEAM MESA YOU KICK FSCKING ASS!!!! Stay legit, your performance work is critical to the success of red camp and FOSS.


Last edited by ElectricPrism on 18 August 2016 at 9:57 pm UTC
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