Article taken from GamingOnLinux.com.

Mesa 10.3 just went stable two days ago. The rolling release distro's are busy shoving it into testing and those brave enough to use such a distro can have some fun with that.As a warning if you're looking for specific tests against FGLRX then I'm not your man as these tests are for gaming ability and not raw performance differences.I conducted the benchmarks this time around to see if the long glaring issue of AA causing quite a large drop was better and so a few more tests have snuck in this time.So here are the results for 10.3:Straight off the bat you can see that Portal 2 continues to gain speed and has jumped another 60 which makes it much more than playable and although I did not test it, I would assume that any AA quality setting will not cause drops in playability.Team Fortress 2 has always been the hardest source game due to the amount of action going on. This time the jump isn't so impressive although still a good 20fps increase however the clear improvement is before I could not run the game acceptably on 2xAA but now hitting 98fps proves that we have come a long way. I can also vouch that 16xAA is fully playable for me although not benchmarked here.Xonotic again is hitting 35 fps increases. Nothing major but now those of you with 120hz monitors can be happy :PUnigine Tropics ran great throughout and for whatever reason remains capped at 60fps despite removing VSync. Very smooth and not really much of a benchmark for southern islands these days.Portal is now hitting ridiculous FPS of 198 on 2xAA and 75 on 16xAA so basically you won't have any trouble with that game (or any source game by the way these look) anymore.Which leaves us with a more disappointing Valley result. For one reason or another it dropped slightly by 0.4 fps. I can only assume it uses features that were not developed in 10.3 or were not optimised (which is quite likely given mesa's focus on GL4 right now which won't be going for performance).I will also say these results do seem to differ with other cards from the same generation, the 7950 is one of the best supported cards on radeonSI right now (but I don't have any other cards, so you're free to test and report back). The basic feeling I'm getting right now for mesa is that if your card is of 7XXX series or lower and you're not feeling the need for GL4 games then the mesa driver might do you some good.It's interesting the recommendation used to be for people to not use mesa driver unless they do primarily 2D stuff, but now I would happily throw GL3 and lower games into the bag and given a years time I would expect to be in the same situation but talking about GL4 instead. This is a handy source to see how much of GL4 is supported and what is left to be done. :)As always, check this Google doc for all the data I captured from the games and the files I used for the benchmarks.If you have any questions about using mesa or how the benchmarks were done then leave them in the comments or drop into #gamingonlinux and I will do my best to respond :).Happy Gaming!