Messages in this thread | | | Subject | [BUG] vmalloc, kmalloc - 2.4.x | From | Grzegorz Jaskiewicz <> | Date | 03 Feb 2003 15:13:42 +0000 |
| |
few days ago i started to port driver for our hardware in company from windows to linux. It is simple ISA card, which gives me interrupt each 8ms. So i can check it state and latch some sort of watchdog on it - saying that i am still running (just for security, if system hangs card is blocking all inputs/outputs).
But anyway, i was collecting all data from the card in dynamically allocated memory. This gives me at least 300 * 20 bytes allocated. i have sigle small allocation running on each interrupt.
Driver is working fine under win2k even if i collect as much as 10000 allocations, afterwards system uses loads of processor.
Linux (2.4.19 ,2.4.20, 2.4.21-pre[1,2,3,4] i tried so far) gives me oups arount 80th allocation.
>From http://hit-six.co.uk/~gj/testmod.tar.bz2 you can download simple module that shows what happends. But be carefull, it oupses very fast !
system is running up2dated Debian(stable), and i am using gcc version: gcc version 2.95.4 20011002
-- Grzegorz Jaskiewicz <gj@pointblue.com.pl> K4 Labs
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |