f4d45d4782
There are still old guests out there that over-exercise MSI-X masking. The current code completely sets-up and tears-down an MSI-X vector on the "use" and "release" callbacks. While this is functional, it can slow an old guest to a crawl. We can easily skip the KVM parts of this so that we keep the MSI route and irqfd setup. We do however need to switch VFIO to trigger a different eventfd while masked. Actually, we have the option of continuing to use -1 to disable the trigger, but by using another EventNotifier we can allow the MSI-X core to emulate pending bits and re-fire the vector once unmasked. MSI code gets updated as well to use the same setup and teardown structures and functions. Prior to this change, an igbvf assigned to a RHEL5 guest gets about 20Mbps and 50 transactions/s with netperf (remote or VF->PF). With this change, we get line rate and 3k transactions/s remote or 2Gbps and 6k+ transactions/s to the PF. No significant change is expected for newer guests with more well behaved MSI-X support. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> |
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| .. | ||
| macio | ||
| a9scu.c | ||
| applesmc.c | ||
| arm11scu.c | ||
| arm_integrator_debug.c | ||
| arm_l2x0.c | ||
| arm_sysctl.c | ||
| cbus.c | ||
| debugexit.c | ||
| eccmemctl.c | ||
| exynos4210_pmu.c | ||
| imx_ccm.c | ||
| ivshmem.c | ||
| Makefile.objs | ||
| max111x.c | ||
| milkymist-hpdmc.c | ||
| milkymist-pfpu.c | ||
| mst_fpga.c | ||
| omap_clk.c | ||
| omap_gpmc.c | ||
| omap_l4.c | ||
| omap_sdrc.c | ||
| omap_tap.c | ||
| pc-testdev.c | ||
| pci-testdev.c | ||
| puv3_pm.c | ||
| pvpanic.c | ||
| sga.c | ||
| slavio_misc.c | ||
| tmp105.c | ||
| tmp105.h | ||
| vfio.c | ||
| vmport.c | ||
| zynq_slcr.c | ||