Vastly improve performance of IRQ handling on stopped interfaces with
this driver by introducing a flag saying we already stopped the device. On my Soekris net4801, this took a ping -i 0.001 from spending 80% of time in interrupt handling to 10% (approx numbers). This was a particular problem for the net4801 because the tree interfaces share the same interrupt, but it would be a problem for any configuration where an unused if_sis interface shares an interrupt with a busy device. Other drivers may have similar problems. Thanks to: Luigi
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=123833
@ -2044,6 +2044,7 @@ sis_init(xsc)
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* Cancel pending I/O and free all RX/TX buffers.
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*/
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sis_stop(sc);
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sc->sis_stopped = 0;
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#ifdef notyet
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if (sc->sis_type == SIS_TYPE_83815 && sc->sis_srr >= NS_SRR_16A) {
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@ -2379,6 +2380,8 @@ sis_stop(sc)
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register int i;
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struct ifnet *ifp;
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if (sc->sis_stopped)
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return;
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SIS_LOCK(sc);
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ifp = &sc->arpcom.ac_if;
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ifp->if_timer = 0;
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@ -2431,6 +2434,7 @@ sis_stop(sc)
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bzero(sc->sis_ldata.sis_tx_list,
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sizeof(sc->sis_ldata.sis_tx_list));
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sc->sis_stopped = 1;
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SIS_UNLOCK(sc);
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return;
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@ -470,6 +470,7 @@ struct sis_softc {
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bus_dma_tag_t sis_tag;
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struct sis_ring_data sis_cdata;
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struct callout sis_stat_ch;
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int sis_stopped;
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#ifdef DEVICE_POLLING
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int rxcycles;
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#endif
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