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...Tested by running {1, 10, 100} {TCP, UDP} STREAM, RR, 4K_RR benchmarks from a guest to a server on the host, on an x86_64 Haswell. The guest runs 4 vCPUs pinned to 4 cores. vhost and the test server are pinned to a core each. All results are the median of 5 runs, with variance well < 10%. Used neper (github.com/google/neper) as test process. Napi increases single stream throughput, but increases cycle cost. The optimizations bring this down. The previous patchset saw a regression with UDP_STREAM, which does not benefit from cleaning tx interrupts in rx napi. This regression is now gone for 10...

...Tested by running {1, 10, 100} {TCP, UDP} STREAM, RR, 4K_RR benchmarks from a guest to a server on the host, on an x86_64 Haswell. The guest runs 4 vCPUs pinned to 4 cores. vhost and the test server are pinned to a core each. All results are the median of 5 runs, with variance well < 10%. Used neper (github.com/google/neper) as test process. Napi increases single stream throughput, but increases cycle cost. The optimizations bring this down. The previous patchset saw a regression with UDP_STREAM, which does not benefit from cleaning tx interrupts in rx napi. This regression is now gone for 10...

Full_Name: Giacomo Catenazzi Version: 1.0.1 OS: Linux (Debian) Submission from: (NULL) (129.132.9.24) >From is.R documentation: `if (exists(is.R) && is.function(is.R) && is.R()) {' ` '## R-specific code `} else {' ` '## S-version of code `}' It should be writen as '' exists("is.R") '' (is.R must be

...Tested by running {1, 10, 100} {TCP, UDP} STREAM, RR, 4K_RR benchmarks from a guest to a server on the host, on an x86_64 Haswell. The guest runs 4 vCPUs pinned to 4 cores. vhost and the test server are pinned to a core each. All results are the median of 5 runs, with variance well < 10%. Used neper (github.com/google/neper) as test process. Napi increases single stream throughput, but increases cycle cost. Processing completions on rx interrupts optimization brings this down, especially for bi-directional workloads. UDP_STREAM is unidirectional and continues to see a ~10% lower throughput....

...Tested by running {1, 10, 100} {TCP, UDP} STREAM, RR, 4K_RR benchmarks from a guest to a server on the host, on an x86_64 Haswell. The guest runs 4 vCPUs pinned to 4 cores. vhost and the test server are pinned to a core each. All results are the median of 5 runs, with variance well < 10%. Used neper (github.com/google/neper) as test process. Napi increases single stream throughput, but increases cycle cost. Processing completions on rx interrupts optimization brings this down, especially for bi-directional workloads. UDP_STREAM is unidirectional and continues to see a ~10% lower throughput....

...Tested by running {1, 10, 100} {TCP, UDP} STREAM, RR, 4K_RR benchmarks from a guest to a server on the host, on an x86_64 Haswell. The guest runs 4 vCPUs pinned to 4 cores. vhost and the test server are pinned to a core each. All results are the median of 5 runs, with variance well < 10%. Used neper (github.com/google/neper) as test process. Napi increases single stream throughput, but increases cycle cost. The optimizations bring this down. The previous patchset saw a regression with UDP_STREAM, which does not benefit from cleaning tx interrupts in rx napi. This regression is now gone for 10...

...Tested by running {1, 10, 100} {TCP, UDP} STREAM, RR, 4K_RR benchmarks from a guest to a server on the host, on an x86_64 Haswell. The guest runs 4 vCPUs pinned to 4 cores. vhost and the test server are pinned to a core each. All results are the median of 5 runs, with variance well < 10%. Used neper (github.com/google/neper) as test process. Napi increases single stream throughput, but increases cycle cost. The optimizations bring this down. The previous patchset saw a regression with UDP_STREAM, which does not benefit from cleaning tx interrupts in rx napi. This regression is now gone for 10...

http://bugs.freedesktop.org/show_bug.cgi?id=26980 Summary: GT230M/nouveau: X server hangs spontaneously Product: xorg Version: 7.5 Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: Driver/nouveau AssignedTo: nouveau at lists.freedesktop.org

With the implementation of napi-tx in virtio driver, we clean tx descriptors from rx napi handler, for the purpose of reducing tx complete interrupts. But this introduces a race where tx complete interrupt has been raised, but the handler finds there is no work to do because we have done the work in the previous rx interrupt handler. A similar issue exists with polling from start_xmit, it is

With the implementation of napi-tx in virtio driver, we clean tx descriptors from rx napi handler, for the purpose of reducing tx complete interrupts. But this introduces a race where tx complete interrupt has been raised, but the handler finds there is no work to do because we have done the work in the previous rx interrupt handler. A similar issue exists with polling from start_xmit, it is