On Thursday 15 February 2007 19:46, bert hubert wrote:
> Both 1 and 2 are currently limiting factors when I enter the 100kqps domain
> of name serving. This doesn't mean the rest of my code is as tight as it
> could be, but I spend a significant portion of time in the kernel even at
> moderate (10kqps effective) loads, even though I already use epoll. A busy
> PowerDNS recursor typically spends 25% to 50% of its time on 'sy' load.
Well, I guess in your workload most of system overhead is because of sockets
creation/destruction, UDP/IP stack work, nic driver, interrupts... I really
doubt async_io could help you... Do you have some oprofile results to share
with us ?
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