Date: Tue, 10 Mar 2026 16:46:30 -0400 From: Michael Butler <imb@protected-networks.net> To: Mark Millard <marklmi@yahoo.com>, "Herbert J. Skuhra" <herbert@gojira.at>, Andrew Turner <andrew@FreeBSD.org> Cc: dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org, freebsd-current <freebsd-current@freebsd.org>, Philip Paeps <philip@freebsd.org> Subject: Re: git: c499ad6f997c - main - virtio: Use bus_dma for ring and indirect buffer allocations [Really: kernel: vtnet0: watchdog timeout on queue xx] Message-ID: <2d25962d-d2fd-41e5-8aec-2ffad3622024@protected-networks.net> In-Reply-To: <15dd35da-4c7c-482b-a212-8eaf761b23ca@yahoo.com> References: <69a71c75.40215.43f39fc6@gitrepo.freebsd.org> <87ecludxuh.wl-herbert@gojira.at> <15dd35da-4c7c-482b-a212-8eaf761b23ca@yahoo.com>
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Commit 1a92fc9 appears to work around the issue on amd64. Thanks! On 3/8/26 22:40, Mark Millard wrote: > On 3/8/26 10:39, Herbert J. Skuhra wrote: >> On Tue, 03 Mar 2026 18:37:57 +0100, Andrew Turner wrote: >>> >>> The branch main has been updated by andrew: >>> >>> URL: https://cgit.FreeBSD.org/src/commit/?id=c499ad6f997c8c5f61c88925e6d1e826d0c0f6c4 >>> >>> commit c499ad6f997c8c5f61c88925e6d1e826d0c0f6c4 >>> Author: Sarah Walker <sarah.walker2@arm.com> >>> AuthorDate: 2026-03-03 16:08:11 +0000 >>> Commit: Andrew Turner <andrew@FreeBSD.org> >>> CommitDate: 2026-03-03 16:29:15 +0000 >>> >>> virtio: Use bus_dma for ring and indirect buffer allocations >>> >>> While the majority of virtio platforms will be fully coherent, some may >>> require cache maintenance or other specific device memory handling (eg for >>> secure partitioning). Using bus_dma allows for these usecases. >>> >>> The virtio buffers are marked as coherent; this should ensure that sync >>> calls are no-ops in the common cases. >>> >>> Reviewed by: andrew >>> Sponsored by: Arm Ltd >>> Differential Revision: https://reviews.freebsd.org/D54959 >>> --- >>> sys/dev/virtio/virtio_ring.h | 27 ++++-- >>> sys/dev/virtio/virtqueue.c | 216 +++++++++++++++++++++++++++++++++++++------ >>> 2 files changed, 209 insertions(+), 34 deletions(-) >> >> After this change I see a lot of "kernel: vtnet0: watchdog timeout on >> queue xx" errors on amd64 (arm64 seems to be OK). > > See below about other reports of the messages. > >> >> Reverting this commit resolves the issue. >> >> > > freebsd-current has the following notes, implicitly referencing official > builders doing official builds: > > QUOTE > On 3/8/26 17:10, Philip Paeps wrote: >> On 2026-03-08 07:10:01 (+0800), Michael Butler wrote: >>> Is anyone else seeing timeouts on virtual interfaces? e.g. >>> >>> Mar 7 15:00:27 george kernel: vtnet0: watchdog timeout on queue 0 >>> Mar 7 15:00:45 george kernel: vtnet0: watchdog timeout on queue 0 >> >> I started seeing these on today's build too. >> >> It seems to happen more or less randomly. I can't point at anything >> specific that might be triggering it. >> >> Philip >> >> > END QUOTE >home | help
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