[BIOS] "Video RAM Cacheable"

[ThePunisher]

Questo settaggio cosa fa esattamente?

Conviene metterlo "Enabled" or "Disabled"?

[lowenz]

Tratto da http://www.rojakpot.com

(fantastico sito per gli smanettoni di BIOS)

"This BIOS feature aims to boost VGA graphics performance by using the processor's Level 2 cache to cache the 64KB VGA graphics memory area from A0000h to AFFFFh.

If this BIOS feature is enabled, the VGA graphics memory area will be cached by the processor's Level 2 cache. This speeds up accesses to the VGA graphics memory area.

If this BIOS feature is disabled, the VGA graphics memory area will not be cached by the processor's Level 2 cache.

From what we have discussed so far, it sounds like caching the VGA graphics memory area is logically the way to go. Caching the VGA graphics memory area will definitely speed up VGA graphics performance by caching accesses to the graphics memory area.

However, reality is far less ideal. For one thing, VGA modes are hardly used at all these days. For compatibility reason, VGA is still used in Windows XP's Safe Mode. It is also used in real mode DOS, if you still use that. Other than that, there is no more use for VGA modes. If VGA graphics modes are not used, no benefit can possibly be realized by enabling this BIOS feature.

Even if you use DOS modes a lot, is there even a point in caching the VGA graphics memory area for better performance? Even the slowest computer today is more than capable of handling VGA graphics with ease. In short, caching the VGA graphics memory area will not bring any noticeable advantage.

On the other hand, caching this memory area will cost you some processor performance. Because some of the processor's Level 2 cache is being diverted to cache the VGA graphics memory area, there is less to keep the processor supplied with data. Consequently, the processor's performance suffers.

Therefore, it is highly recommended that you disable this BIOS feature. There is no reason to enable it even if you use real mode DOS a lot or work a lot in Windows Safe Mode."

in pratica non serve a nulla dato che nessuno usa ormai la modalità VGA anzi ruba cache al processore
-DISABLE-

[85kimeruccio]

diciamo ke tutte quelle menate possono essee disabilitate..