similar to: Performance regression with virtio_net

On Thu, Jul 27, 2017 at 04:14:30PM -0500, Seth Forshee wrote: > On Thu, Jul 27, 2017 at 11:38:52PM +0300, Michael S. Tsirkin wrote: > > On Thu, Jul 27, 2017 at 12:09:42PM -0500, Seth Forshee wrote: > > > I'm seeing a performance regression with virtio_net that looks to have > > > started in 4.12-rc1. I only see it in one context though, downloading > > >

On Thu, Jul 27, 2017 at 04:14:30PM -0500, Seth Forshee wrote: > On Thu, Jul 27, 2017 at 11:38:52PM +0300, Michael S. Tsirkin wrote: > > On Thu, Jul 27, 2017 at 12:09:42PM -0500, Seth Forshee wrote: > > > I'm seeing a performance regression with virtio_net that looks to have > > > started in 4.12-rc1. I only see it in one context though, downloading > > >

Seth Forshee noticed a performance degradation with some workloads. This turns out to be due to packet drops. Euan Kemp noticed that this is because we drop all packets where length exceeds the truesize, but for some packets we add in extra memory without updating the truesize. This in turn was kept around unchanged from ab7db91705e95 ("virtio-net: auto-tune mergeable rx buffer size for

Seth Forshee noticed a performance degradation with some workloads. This turns out to be due to packet drops. Euan Kemp noticed that this is because we drop all packets where length exceeds the truesize, but for some packets we add in extra memory without updating the truesize. This in turn was kept around unchanged from ab7db91705e95 ("virtio-net: auto-tune mergeable rx buffer size for

On Fri, Jan 20, 2023 at 04:12:20PM -0600, Seth Forshee (DigitalOcean) wrote: > We've fairly regularaly seen liveptches which cannot transition within kpatch's > timeout period due to busy vhost worker kthreads. In looking for a solution the > only answer I found was to call klp_update_patch_state() from a safe location. > I tried adding this call to vhost_worker(), and it

On Wed 2023-01-25 10:57:30, Seth Forshee wrote: > On Wed, Jan 25, 2023 at 12:34:26PM +0100, Petr Mladek wrote: > > On Tue 2023-01-24 11:21:39, Seth Forshee wrote: > > > On Tue, Jan 24, 2023 at 03:17:43PM +0100, Petr Mladek wrote: > > > > On Fri 2023-01-20 16:12:22, Seth Forshee (DigitalOcean) wrote: > > > > > Livepatch relies on stack checking of

Hello, By having a look at 'drivers/platform/x86/apple-gmux.c', it seems its author is Seth Forshee <seth.forshee at canonical.com>. Other main contributors are Andreas Heider <andreas at meetr.de>, and Matthew Garrett <mjg at redhat.com>, among others. Pierre Moreau On 11:58 PM - Jul 26 2014, Evan Foss wrote: > Hello, > > Sorry I know this might be the

On Thu 2023-01-26 15:12:35, Seth Forshee (DigitalOcean) wrote: > On Thu, Jan 26, 2023 at 06:03:16PM +0100, Petr Mladek wrote: > > On Fri 2023-01-20 16:12:20, Seth Forshee (DigitalOcean) wrote: > > > We've fairly regularaly seen liveptches which cannot transition within kpatch's > > > timeout period due to busy vhost worker kthreads. > > > > I have

On Thu, Jan 26, 2023 at 08:43:55PM -0800, Josh Poimboeuf wrote: > On Thu, Jan 26, 2023 at 03:12:35PM -0600, Seth Forshee (DigitalOcean) wrote: > > On Thu, Jan 26, 2023 at 06:03:16PM +0100, Petr Mladek wrote: > > > On Fri 2023-01-20 16:12:20, Seth Forshee (DigitalOcean) wrote: > > > > We've fairly regularaly seen liveptches which cannot transition within

On 11/12/2020 10:44 AM, Raymond Herrera wrote: > Following the advice obtained here, I am trying to get a LetsEncrypt > certificate. > > These are the instructions: > > Step 1: > https://snapcraft.io/docs/installing-snapd > > Step 2: > https://certbot.eff.org/lets-encrypt/centosrhel7-apache > > My problem is this error message: > > # snap install

On Sun, Jan 12, 2014 at 03:32:28PM -0800, Michael Dalton wrote: > Hi Michael, > > On Sun, Jan 12, 2014 at 9:09 AM, Michael S. Tsirkin <mst at redhat.com> wrote: > > Can't we add struct attribute * to netdevice, and pass that in when > > creating the kobj? > > I like that idea, I think that will work and should be better than > the alternatives. The actual

Hi Michael, On Sun, Jan 12, 2014 at 9:09 AM, Michael S. Tsirkin <mst at redhat.com> wrote: > Can't we add struct attribute * to netdevice, and pass that in when > creating the kobj? I like that idea, I think that will work and should be better than the alternatives. The actual kobjs for RX queues (struct netdev_rx_queue) are allocated and deallocated by calls to

Hi Michael, On Sun, Jan 12, 2014 at 9:09 AM, Michael S. Tsirkin <mst at redhat.com> wrote: > Can't we add struct attribute * to netdevice, and pass that in when > creating the kobj? I like that idea, I think that will work and should be better than the alternatives. The actual kobjs for RX queues (struct netdev_rx_queue) are allocated and deallocated by calls to

On Fri 2023-01-20 16:12:20, Seth Forshee (DigitalOcean) wrote: > We've fairly regularaly seen liveptches which cannot transition within kpatch's > timeout period due to busy vhost worker kthreads. I have missed this detail. Miroslav told me that we have solved something similar some time ago, see https://lore.kernel.org/all/20220507174628.2086373-1-song at kernel.org/ Honestly,

On Tue, May 30, 2017 at 07:26:37PM +0300, Michael S. Tsirkin wrote: > On Fri, May 26, 2017 at 03:31:33PM -0400, bfields at fieldses.org wrote: > > Looks like the culprit is very likely d85b758f72b0 "virtio_net: fix > > support for small rings". > > > > After that patch, my NFS server VM stops responding to packets after a > > few minutes of testing.

On Tue, May 30, 2017 at 07:26:37PM +0300, Michael S. Tsirkin wrote: > On Fri, May 26, 2017 at 03:31:33PM -0400, bfields at fieldses.org wrote: > > Looks like the culprit is very likely d85b758f72b0 "virtio_net: fix > > support for small rings". > > > > After that patch, my NFS server VM stops responding to packets after a > > few minutes of testing.

Following the advice obtained here, I am trying to get a LetsEncrypt certificate. These are the instructions: Step 1: https://snapcraft.io/docs/installing-snapd Step 2: https://certbot.eff.org/lets-encrypt/centosrhel7-apache My problem is this error message: # snap install --classic certbot error: system does not fully support snapd: cannot mount squashfs image using "squashfs":

Hi I see severe network performance degradation with the kernels 4.12-rc1 and 4.12-rc2 in the network virtio driver. Download rate drops down to about 100kB/s. I bisected it and it is caused by patch d85b758f72b05a774045545f24d70980e3e9aac4 ("virtio_net: fix support for small rings"). When I revert this patch, the problem goes away. The host is Debian Jessie with kernel 4.4.62,

Hi I see severe network performance degradation with the kernels 4.12-rc1 and 4.12-rc2 in the network virtio driver. Download rate drops down to about 100kB/s. I bisected it and it is caused by patch d85b758f72b05a774045545f24d70980e3e9aac4 ("virtio_net: fix support for small rings"). When I revert this patch, the problem goes away. The host is Debian Jessie with kernel 4.4.62,

On Mon, May 22, 2017 at 10:25:19AM -0400, Mikulas Patocka wrote: > Hi > > I see severe network performance degradation with the kernels 4.12-rc1 and > 4.12-rc2 in the network virtio driver. Download rate drops down to about > 100kB/s. > > I bisected it and it is caused by patch > d85b758f72b05a774045545f24d70980e3e9aac4 ("virtio_net: fix support for > small