Re: What is "Fast task queue"? (Was: How to understand what `swi
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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 =D0=B0=D0=B2=D0=B3=D1=83=D1=81=D1=82=D0=B0 2012 =D0=B3., =
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 th=
at=20
> thread.
>> Yep, I've found, that my if_vr uses it. One more question: does ipf=
w
>> rules works in same thread? I have ``net.isr.dispatch=3D"direct"'' se=
t.
>=20
> 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.
>=20
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=3D$ncpu (2, 4 or whatever you want)
net.isr.dispatch=3Ddeferred
PS: original patch was written by melifaro.
[1] http://people.freebsd.org/~zont/netisr.patch
--=20
Andrey Zonov
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