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On Wed, May 31, 2023 at 04:49:39PM -0400, Vivek Goyal wrote: > On Wed, May 31, 2023 at 10:34:15PM +0200, Peter-Jan Gootzen wrote: > > On 31/05/2023 21:18, Vivek Goyal wrote: > > > On Wed, May 31, 2023 at 07:10:32PM +0200, Peter-Jan Gootzen wrote: > > >> When the Virtio queue is full, a work item is scheduled > > >> to execute in 1ms that retries adding the request to the queue. &g...

On 01/06/2023 16:08, Stefan Hajnoczi wrote: > On Wed, May 31, 2023 at 04:49:39PM -0400, Vivek Goyal wrote: >> On Wed, May 31, 2023 at 10:34:15PM +0200, Peter-Jan Gootzen wrote: >>> On 31/05/2023 21:18, Vivek Goyal wrote: >>>> On Wed, May 31, 2023 at 07:10:32PM +0200, Peter-Jan Gootzen wrote: >>>>> When the Virtio queue is full, a work item is scheduled >>>>> to execute in 1ms that retries adding the request to the...

On Wed, May 31, 2023 at 10:34:15PM +0200, Peter-Jan Gootzen wrote: > On 31/05/2023 21:18, Vivek Goyal wrote: > > On Wed, May 31, 2023 at 07:10:32PM +0200, Peter-Jan Gootzen wrote: > >> When the Virtio queue is full, a work item is scheduled > >> to execute in 1ms that retries adding the request to the queue. > >> This is...

...aken off, immediately fills it back up with queued requests. This reduces the 99.9th percentile latencies in our tests by 60x and slightly increases the overall throughput, when using a queue depth 2x the size of the Virtio queue size, with a DPU-powered virtio-fs device. Signed-off-by: Peter-Jan Gootzen <peter-jan at gootzen.net> --- fs/fuse/virtio_fs.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c index 4d8d4f16c727..8af9d3dc61d3 100644 --- a/fs/fuse/virtio_fs.c +++ b/fs/fuse/virtio_fs.c @@ -347,6 +347,8 @@ static v...

...aken off, immediately fills it back up with queued requests. This reduces the 99.9th percentile latencies in our tests by 60x and slightly increases the overall throughput, when using a queue depth 2x the size of the Virtio queue size, with a DPU-powered virtio-fs device. Signed-off-by: Peter-Jan Gootzen <peter-jan at gootzen.net> --- V4: Removed return value on error changes to simplify patch, that should be changed in another patch. V3: Fixed requests falling into the void when -ENOMEM and no new incoming requests. Virtio-fs now always lets -ENOMEM bubble up to userspace. Also made queue fu...

On Tue, Feb 07, 2023 at 11:14:46AM +0100, Peter-Jan Gootzen wrote: > Hi, > > For my MSc thesis project in collaboration with IBM > (https://github.com/IBM/dpu-virtio-fs) we are looking to improve the > performance of the virtio-fs driver in high throughput scenarios. We think > the main bottleneck is the fact that the virtio-fs driver doe...

...aken off, immediately fills it back up with queued requests. This reduces the 99.9th percentile latencies in our tests by 60x and slightly increases the overall throughput, when using a queue depth 2x the size of the Virtio queue size, with a DPU-powered virtio-fs device. Signed-off-by: Peter-Jan Gootzen <peter-jan at gootzen.net> --- V1 -> V2: Not scheduling dispatch work anymore when not needed and changed delayed_work structs to work_struct structs fs/fuse/virtio_fs.c | 32 +++++++++++++++++--------------- 1 file changed, 17 insertions(+), 15 deletions(-) diff --git a/fs/fuse/virtio_...

On 08/02/2023 11:43, Stefan Hajnoczi wrote: > On Wed, Feb 08, 2023 at 09:33:33AM +0100, Peter-Jan Gootzen wrote: >> >> >> On 07/02/2023 22:57, Vivek Goyal wrote: >>> On Tue, Feb 07, 2023 at 04:32:02PM -0500, Stefan Hajnoczi wrote: >>>> On Tue, Feb 07, 2023 at 02:53:58PM -0500, Vivek Goyal wrote: >>>>> On Tue, Feb 07, 2023 at 02:45:39PM -0500, Stefan...