[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH] xen/netfront: Fix TX response spurious interrupts
On Thu, Jul 10, 2025 at 01:05:47PM -0700, Elliott Mitchell wrote: >On Thu, Jul 10, 2025 at 04:11:15PM +0000, Anthoine Bourgeois wrote: >> We found at Vates that there are lot of spurious interrupts when >> benchmarking the PV drivers of Xen. This issue appeared with a patch >> that addresses security issue XSA-391 (see Fixes below). On an iperf >> benchmark, spurious interrupts can represent up to 50% of the >> interrupts. > >If this is the correct fix, near-identical fixes are needed for *all* >of the Xen front-ends. Xen virtual block-devices and Xen PCI-passthrough >devices are also effected by a similar issue. > blkfront doesn't call the response handle from multiple places. It doesn't seem to be affected by this problem. And pcifront neither. >Thanks for finding a candidate fix, this effects many other people who >have been troubled by this performance issue. > >FreeBSD will also need a similar fix. In FreeBSD, netfront may also be affected. xn_assemble_tx_request calls xn_txeof. blkfront and pcifront seems good. Regards, Anthoine Anthoine Bourgeois | Vates XCP-ng Developer XCP-ng & Xen Orchestra - Vates solutions web: https://vates.tech
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