patch-2.3.34 linux/Documentation/video4linux/bttv/README.PCI

• Lines: 37
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.33/linux/Documentation/video4linux/bttv/README.PCI
• Orig date: Sun Aug 23 13:32:25 1998

diff -u --recursive --new-file v2.3.33/linux/Documentation/video4linux/bttv/README.PCI linux/Documentation/video4linux/bttv/README.PCI
@@ -1,36 +0,0 @@
-Because some people were asking about the bandwidth the Bt848 might use up
-on the PCI bus I did a little benchmark.
-
-"bonnie -s 200" with a Fireball TM 3.8 Gb using Busmaster DMA on an ASUS P6NP5
-
-without capturing:
-
-              -------Sequential Output-------- ---Sequential Input-- --Random--
-              -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
-Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
-          200  5353 76.6  5898 16.9  2363 12.1  5889 51.3  6416 10.2  37.8  0.9
-
-
-while capturing full screen PAL (786x576) with 24bpp:
-
-              -------Sequential Output-------- ---Sequential Input-- --Random--
-              -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
-Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
-          200  5619 69.3  5939 16.9  2334 12.0  5859 50.9  6441 10.5  37.9  0.9
-
-The differences are small and probably within the normal error margin of
-bonnie.
-So, one bt848 card does not have much(any?) impact on the normal operation 
-of a Linux system.
-If you have several cards running this will look very differently!
-The same is probably true if your Linux box is used as a file server 
-with 15 (or 30) SCSI drives.
- 
-I tested having 2 Bt848 cards grabbing in 32 bit mode (That's almost 100MB/s!)
-while running bonnie.
-The xtvscreen windows showed severe pixel errors.
-After a while the ide driver failed to use DMA and switched DMA off.
-It continued running but the results where bad.
-
-
-