Date: Wed, 29 Aug 2012 11:17:09 +0400 From: Andrey Zonov <zont@FreeBSD.org> To: lev@freebsd.org Cc: freebsd-current@freebsd.org Subject: Re: What is "Fast task queue"? (Was: How to understand what `swi5' kernel thread does?) Message-ID: <503DC1F5.1070207@FreeBSD.org> In-Reply-To: <201208280744.23419.jhb@freebsd.org> References: <135297243.20120827061957@serebryakov.spb.ru> <201208271226.03496.jhb@freebsd.org> <1758728845.20120828004713@serebryakov.spb.ru> <201208280744.23419.jhb@freebsd.org>
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[-- Attachment #1 --] 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 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.18 (Darwin) Comment: GPGTools - http://gpgtools.org iQEcBAEBAgAGBQJQPcH5AAoJEBWLemxX/CvTcdoH+QFHz7eOQCBkSiaRXJrH38ey giyG+VuW9V5/O8Q4u05hyUbq/af67O1NELiGviXu4mjo+yO7egDBp34LfMIKNtW6 onzMYsS2IYML2518q3TlMfRZu3raQT+/kXJStosAfU3sJUSAS/FO2wIF77Uimeut 48jfh3tTB66VfMu2k9gCMGIVEKL4TnTbfMKG5VkHS/I1EBJcdwYlPSGB3C6ef3qG Yx5AO2KM+ow6MH1k88cT5kpJM4qNUUv83C2FPnWlUAWEVCWednn9lAy9optMqtWj vlY/fBLBcPk7/oFkkhlusuhx+l+d+SmZ5GX0vosipzLcHR/u7s0unDOZ3T4L1Wg= =0g6c -----END PGP SIGNATURE-----help
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