512mb sollten doch problemloos reichen da ein durschnittlicher sender so pi*daumen 500kb/s abwirft.
du brauchst eigendlich nur einen ordner anlegen und auf /dev/shm verlinken wenn im kernel die dynamische ramdisk aktiv ist.
der kernel zweigt dann automatisch nur so viel ram ab wie an datenaufkommen gespeichert wird.
mit welchen optionen dein kernel läuft kannst du in deinem konfigurationsfile (.config) sehen so du in selber gebacken hast.
ansonnsten steht zu den laufenden kerneltreibern auch einiges im systemlogfile( normalerweise /var/log/messages).
so sieht es auf meiner hardware aus wobei mit meiner aktuellen kernelconfiguration keine hohen latencytimereinstellungen für vga und dvb aktiv sind und es auch so prima läuft.
[root@localhost ~]# lspci
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 746 Host (rev 10)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] SG86C202
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS964 [MuTIOL Media IO] (r
ev 36)
00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev 01)
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] AC'97 Soun
d Controller (rev a0)
00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev
0f)
00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev
0f)
00:03.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.0 Controller (rev
0f)
00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] SiS900 PCI Fast Et
hernet (rev 90)
00:0d.0 Multimedia controller: Philips Semiconductors SAA7146 (rev 01)
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 NJ [Radeon 9800 XT
]
01:00.1 Display controller: ATI Technologies Inc RV350 NJ [Radeon 9800 XT] (Seco
ndary)
[root@localhost ~]# lspci -nv
00:00.0 0600: 1039:0746 (rev 10)
Subsystem: 1849:0746
Flags: bus master, medium devsel, latency 0
Memory at d0000000 (32-bit, non-prefetchable) [size=32M]
Capabilities: [c0] AGP version 3.0
00:01.0 0604: 1039:0002
Flags: bus master, fast devsel, latency 32
Bus: primary=00, secondary=01, subordinate=02, sec-latency=32
I/O behind bridge: 0000a000-0000afff
Memory behind bridge: cfd00000-cfefffff
Prefetchable memory behind bridge: afa00000-cfbfffff
00:02.0 0601: 1039:0964 (rev 36)
Flags: bus master, medium devsel, latency 0
00:02.5 0101: 1039:5513 (rev 01) (prog-if 80)
Subsystem: 1849:5513
Flags: bus master, medium devsel, latency 128
I/O ports at 01f0 [size=8]
I/O ports at 03f4 [size=1]
I/O ports at 0170 [size=8]
I/O ports at 0374 [size=1]
I/O ports at ff00 [size=16]
Capabilities: [58] Power Management version 2
00:02.7 0401: 1039:7012 (rev a0)
Subsystem: 1849:7012
Flags: bus master, medium devsel, latency 32, IRQ 21
I/O ports at dc00 [size=256]
I/O ports at d800 [size=128]
Capabilities: [48] Power Management version 2
00:03.0 0c03: 1039:7001 (rev 0f) (prog-if 10)
Subsystem: 1849:7001
Flags: bus master, medium devsel, latency 32, IRQ 16
Memory at cfffd000 (32-bit, non-prefetchable) [size=4K]
00:03.1 0c03: 1039:7001 (rev 0f) (prog-if 10)
Subsystem: 1849:7001
Flags: bus master, medium devsel, latency 32, IRQ 17
Memory at cfffe000 (32-bit, non-prefetchable) [size=4K]
00:03.2 0c03: 1039:7001 (rev 0f) (prog-if 10)
Subsystem: 1849:7001
Flags: bus master, medium devsel, latency 32, IRQ 18
Memory at cffff000 (32-bit, non-prefetchable) [size=4K]
00:04.0 0200: 1039:0900 (rev 90)
Subsystem: 1849:8201
Flags: bus master, medium devsel, latency 32, IRQ 19
I/O ports at d400 [size=256]
Memory at cfffc000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at 70000000 [disabled] [size=128K]
Capabilities: [40] Power Management version 2
00:0d.0 0480: 1131:7146 (rev 01)
Subsystem: 13c2:0000
Flags: bus master, medium devsel, latency 32, IRQ 20
Memory at cfffbe00 (32-bit, non-prefetchable) [size=512]
01:00.0 0300: 1002:4e4a
Subsystem: 1002:0002
Flags: bus master, stepping, 66MHz, medium devsel, latency 32, IRQ 22
Memory at c0000000 (32-bit, prefetchable) [size=128M]
I/O ports at a800 [size=256]
Memory at cfef0000 (32-bit, non-prefetchable) [size=64K]
Expansion ROM at cfec0000 [disabled] [size=128K]
Capabilities: [58] AGP version 3.0
Capabilities: [50] Power Management version 2
01:00.1 0380: 1002:4e6a
Subsystem: 1002:0003
Flags: bus master, stepping, 66MHz, medium devsel, latency 32
Memory at b8000000 (32-bit, prefetchable) [size=128M]
Memory at cfee0000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [50] Power Management version 2
[root@localhost ~]#
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