Messages in this thread | | | Date | Mon, 4 Feb 2002 13:16:51 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: Short question regarding generic_make_request() |
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On Mon, 4 Feb 2002, Steffen Persvold wrote:
> [root@damd1 root]# ping sci4 > PING sci4 (192.168.4.4) from 192.168.4.3 : 56(84) bytes of data. > 64 bytes from sci4 (192.168.4.4): icmp_seq=0 ttl=255 time=238 usec
> For simplicity I'll say ~200usec. When I change the receive handler > from a tasklet to a kernel thread, the numbers look like this : > > [root@damd1 root]# ping sci4 > PING sci4 (192.168.4.4) from 192.168.4.3 : 56(84) bytes of data. > 64 bytes from sci4 (192.168.4.4): icmp_seq=0 ttl=255 time=4.215 msec > 64 bytes from sci4 (192.168.4.4): icmp_seq=1 ttl=255 time=5.728 msec
this shows some sort of wakeup or softirq handling irregularity. A number of softirq latency bugs were fixed, i'd suggest to try this with any recent kernel (or recent errata kernel rpms).
Ingo
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