On Fri, May 17, 2024 at 09:04:33PM +0200, Peter-Jan Gootzen wrote: > This patch set aims to improve the latencies of virtio-fs requests when > the system is under high load, namely when the application's IO depth > is greater than the size of the Virtio queue. > > We found that the handling of -ENOMEM when enqueueing requests is > inconsistent with other parts of the kernel (e.g. FUSE) and also > obstructs optimizing the enqueueing behavior. > > It is important to first remove the -ENOMEM behavior as the new style of > retrying virtio-fs requests in patch 2/2 is only correct in case of > -ENOSPC. With -ENOMEM the failed enqueue might never be retried as there > might not be another completion to trigger retrying the enqueue. > > Note that this patch series is a revival of my patch that was last > discussed in the mailing list on 2023-08-16. > > Peter-Jan Gootzen (2): > virtio-fs: let -ENOMEM bubble up or burst gently > virtio-fs: improved request latencies when Virtio queue is full > > fs/fuse/virtio_fs.c | 40 ++++++++++++++++++++++------------------ > 1 file changed, 22 insertions(+), 18 deletions(-) > > -- > 2.34.1 > This is a nice improvement, thank you! Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
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