2.4.17 & bttv: vmalloc failures with 1GB memory

i'm having problems using video capture under linux. i've tried several capturing programs using libavifile. i can sometimes get capturing to work right after reboot, but after using machine for some time (cache/buffers fill up etc?), it stops working and i get messages like this:

Jan  2 23:25:44 xxx kernel: bttv: vmalloc_32(4259840) failed
Jan  2 23:25:44 xxx kernel: bttv: vmalloc_32(4259840) failed
Jan  2 23:26:50 xxx last message repeated 13 times

currently i'm using stock kernel 2.4.17 with 4gb highmem support and bttv. my system is as follows:

athlonxp 1600+
epox 8kha+
1GB memory
bt878 tv-card

could this be related to the recent allocation and cache freeing problems?

please cc me on replys.

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