On 06.09.2014 23:43, Alexander Motin wrote: > Author: mav > Date: Sat Sep 6 19:43:48 2014 > New Revision: 271207 > URL: http://svnweb.freebsd.org/changeset/base/271207 > > Log: > Save one register read (AHCI_IS) for AHCI controllers with only one port. > > For controllers with only one port (like PCIe or M.2 SSDs) interrupt can > come from only one source, and skipping read saves few percents of CPU time. > > MFC after: 1 month > H/W donated by: I/O Switch This one causes tons of "Interrupt storm" messages (and inability to boot) for SATA AHCI VirtualBox disk controller. > > Modified: > head/sys/dev/ahci/ahci.c > > Modified: head/sys/dev/ahci/ahci.c > ============================================================================== > --- head/sys/dev/ahci/ahci.c Sat Sep 6 19:39:12 2014 (r271206) > +++ head/sys/dev/ahci/ahci.c Sat Sep 6 19:43:48 2014 (r271207) > @@ -359,7 +359,9 @@ ahci_setup_interrupt(device_t dev) > for (i = 0; i < ctlr->numirqs; i++) { > ctlr->irqs[i].ctlr = ctlr; > ctlr->irqs[i].r_irq_rid = i + (ctlr->msi ? 1 : 0); > - if (ctlr->numirqs == 1 || i >= ctlr->channels || > + if (ctlr->channels == 1 && !ctlr->ccc) > + ctlr->irqs[i].mode = AHCI_IRQ_MODE_ONE; > + else if (ctlr->numirqs == 1 || i >= ctlr->channels || > (ctlr->ccc && i == ctlr->cccv)) > ctlr->irqs[i].mode = AHCI_IRQ_MODE_ALL; > else if (i == ctlr->numirqs - 1) > >
_______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
