MAMEWorld >> EmuChat
Previous thread Previous  View all threads Index   Next thread Next   Flat Mode Flat  

Haze
Reged: 09/23/03
Posts: 5245
Send PM
Re: Virtua Fighter Kids performance regression.
05/03/18 12:12 PM


> Yeppers, saw that in the Shoutbox before it scrolled off, thanks.

right

there are more worrying regressions which aren't, like the Seibu SPI stuff dropping to less than half the speed it was in feb (300% ->120%)

that was caused by cam900 using the memory interface for the sound chip
https://github.com/mamedev/mame/commit/4...a5caa901b99f8c6

literally 50-70% of the frametime is now spent in the memory read functions for the sound, and it barely keeps above 120% on a 4ghz i7 during the startup, way below that on a pretty decent machine.

while the 'device_rom_interface' stuff is 'cleaner', I don't think the performance cost is in any way acceptable there, it's now by far the heaviest thing in the driver, for no actual gain.

this is the kind of performance loss which will cause people to refuse to upgrade forever if they hit it, and the type which gives MAME a bad reputation as there's no benefit at all to them upgrading in this instance, and it's a popular driver.

the STV stuff on the other hand is legitimate enduser visible improvements.







Entire thread
Subject Posted by Posted on
* Virtua Fighter Kids performance regression. John IV 05/01/18 08:58 AM
. * Re: Virtua Fighter Kids performance regression. John IV  05/02/18 05:42 AM
. * Re: Virtua Fighter Kids performance regression. TafoidAdministrator  05/03/18 03:42 AM
. * Re: Virtua Fighter Kids performance regression. John IV  05/03/18 06:25 AM
. * Re: Virtua Fighter Kids performance regression. Haze  05/03/18 12:12 PM
. * Re: Virtua Fighter Kids performance regression. Olivier Galibert  05/03/18 04:45 PM
. * Re: Virtua Fighter Kids performance regression. Haze  05/03/18 05:38 PM
. * Re: Virtua Fighter Kids performance regression. Olivier Galibert  05/05/18 04:03 PM
. * Re: Virtua Fighter Kids performance regression. smf  05/06/18 09:03 AM
. * Re: Virtua Fighter Kids performance regression. AJR Hacker  05/05/18 10:01 PM
. * Re: Virtua Fighter Kids performance regression. Olivier Galibert  05/08/18 07:55 PM

Extra information Permissions
Moderator:  Robbbert, Tafoid 
0 registered and 145 anonymous users are browsing this forum.
You cannot start new topics
You cannot reply to topics
HTML is enabled
UBBCode is enabled
Thread views: 1158