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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This archive was generated by hypermail 2b29 : Thu Feb 07 2002 - 21:00:32 EST