On 8/28/12 3:44 PM, John Baldwin wrote: > On Monday, August 27, 2012 4:47:13 pm Lev Serebryakov wrote: >> Hello, John. >> You wrote 27 августа 2012 г., 20:26:03: >> >>>> What "fast tasks" are performed via this queue? Under network load it >>>> is main consumer of CPU. >> JB> Certain NIC drivers perform much of their interrupt handling in that > thread. >> Yep, I've found, that my if_vr uses it. One more question: does ipfw >> rules works in same thread? I have ``net.isr.dispatch="direct"'' set. > > Yes, with the default setting of direct dispatch, all of the receive > side of the network stack runs in the driver's interrupt handler. In > the case of vr(4) that would be in this thread. >
Lev, If you have more than one CPU, you can try this patch [1]. It adds flowid in mbufs and makes possible to use multiple netisr threads. Apply the patch and put in your loader.conf the following: net.isr.maxthreads=$ncpu (2, 4 or whatever you want) net.isr.dispatch=deferred PS: original patch was written by melifaro. [1] http://people.freebsd.org/~zont/netisr.patch -- Andrey Zonov
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