Messages in this thread |  | | Date | Sat, 30 Dec 2000 19:16:39 +0100 | From | Andrea Arcangeli <> | Subject | Re: 2.2.19pre3 and poor reponse to RT-scheduled processes? |
| |
On Fri, Dec 29, 2000 at 04:54:23PM -0500, Rafal Boni wrote: > Now my box behaves much more reasonably... I'll just have to beat harder > on it and see what happens.
Another thing: while writing to disk if you want low latency readers you can do:
elvtune -r 1 /dev/hd[abcd]
The 1/2 seconds stalls you see could be just because of applications that waits I/O synchronously while the elevator is reodering I/O requests (and even if the elevator wouldn't reorder anything the new requests would go to the end of the I/O queue so they would have some higher latency anyways). That's normal and if it's the case to avoid those stalls you can only decrease the I/O load or increase disk throughput ;). The important thing is that the kernel is not sitting in a tight kernel loop without reschedule in it during such 2 seconds.
However 2.2.19pre3aa4 includes also the lowlatency bugfixes in case you have tons of ram and you're sending huge buffers to syscalls.
Andrea - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |