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L2ARC: Restrict write size to 1/4 of the device #15519
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@gamanakis What would you say about different approach? |
gamanakis
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Nov 13, 2023
@amotin looks good to me, thank you! |
behlendorf
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Nov 13, 2023
PR openzfs#15457 exposed weird logic in L2ARC write sizing. If it appeared bigger than device size, instead of liming write it reset all the system-wide tunables to their default. Aside of being excessive, it did not actually help with the problem, still allowing infinite loop to happen. This patch removes the tunables reverting logic, but instead limits L2ARC writes (or at least eviction/trim) to 1/4 of the capacity. Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc.
Aligned write size to vdev_ashift, otherwise vdev_trim_simple() could be unhappy. |
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Nov 14, 2023
lundman
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Dec 12, 2023
PR openzfs#15457 exposed weird logic in L2ARC write sizing. If it appeared bigger than device size, instead of liming write it reset all the system-wide tunables to their default. Aside of being excessive, it did not actually help with the problem, still allowing infinite loop to happen. This patch removes the tunables reverting logic, but instead limits L2ARC writes (or at least eviction/trim) to 1/4 of the capacity. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Amanakis <gamanakis@gmail.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes openzfs#15519
mmatuska
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Dec 27, 2023
PR openzfs#15457 exposed weird logic in L2ARC write sizing. If it appeared bigger than device size, instead of liming write it reset all the system-wide tunables to their default. Aside of being excessive, it did not actually help with the problem, still allowing infinite loop to happen. This patch removes the tunables reverting logic, but instead limits L2ARC writes (or at least eviction/trim) to 1/4 of the capacity. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Amanakis <gamanakis@gmail.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes openzfs#15519
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behlendorf
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Jan 9, 2024
PR #15457 exposed weird logic in L2ARC write sizing. If it appeared bigger than device size, instead of liming write it reset all the system-wide tunables to their default. Aside of being excessive, it did not actually help with the problem, still allowing infinite loop to happen. This patch removes the tunables reverting logic, but instead limits L2ARC writes (or at least eviction/trim) to 1/4 of the capacity. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Amanakis <gamanakis@gmail.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15519
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PR #15457 exposed weird logic in L2ARC write sizing. If it appeared bigger than device size, instead of liming write it reset all the system-wide tunables to their default. Aside of being excessive, it did not actually help with the problem, still allowing infinite loop to happen.
This patch removes the tunables reverting logic, but instead limits L2ARC writes (or at least eviction/trim) to 1/4 of the capacity.
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