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Date: Sun, 04 Jan 2015 16:38:17 +0800 From: Jason Wang <jasowang@...hat.com> To: "Michael S. Tsirkin" <mst@...hat.com> CC: rusty@...tcorp.com.au, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH 0/3] Sharing MSIX irq for tx/rx queue pairs On 12/28/2014 03:52 PM, Michael S. Tsirkin wrote: > On Fri, Dec 26, 2014 at 10:53:42AM +0800, Jason Wang wrote: >> Hi all: >> >> This series try to share MSIX irq for each tx/rx queue pair. This is >> done through: >> >> - introducing virtio pci channel which are group of virtqueues that >> sharing a single MSIX irq (Patch 1) >> - expose channel setting to virtio core api (Patch 2) >> - try to use channel setting in virtio-net (Patch 3) >> >> For the transport that does not support channel, channel paramters >> were simply ignored. For devices that does not use channel, it can >> simply pass NULL or zero to virito core. >> >> With the patch, 1 MSIX irq were saved for each TX/RX queue pair. >> >> Please review. > How does this sharing affect performance? > Patch 3 only checks more_used() for tx ring which in fact reduces the effect of event index and may introduce more tx interrupts. After fixing this issue, tested with 1 vcpu and 1 queue. No obvious changes in performance were noticed. Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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