similar to: large packet support in netfront driver and guest network throughput

On Tue, Sep 29, 2020 at 3:32 PM Willem de Bruijn <willemdebruijn.kernel at gmail.com> wrote: > > On Tue, Sep 29, 2020 at 4:00 AM <xiangxia.m.yue at gmail.com> wrote: > > > > From: Tonghao Zhang <xiangxia.m.yue at gmail.com> > > > > Open vSwitch and Linux bridge will disable LRO of the interface > > when this interface added to them. Now when

From: Eric Dumazet <edumazet at google.com> Straightforward patch to add GRO processing to virtio_net. napi_complete_done() usage allows more aggressive aggregation, opted-in by setting /sys/class/net/xxx/gro_flush_timeout Tested: Setting /sys/class/net/xxx/gro_flush_timeout to 1000 nsec, Rick Jones reported following results. One VM of each on a pair of OpenStack compute nodes with

From: Eric Dumazet <edumazet at google.com> Straightforward patch to add GRO processing to virtio_net. napi_complete_done() usage allows more aggressive aggregation, opted-in by setting /sys/class/net/xxx/gro_flush_timeout Tested: Setting /sys/class/net/xxx/gro_flush_timeout to 1000 nsec, Rick Jones reported following results. One VM of each on a pair of OpenStack compute nodes with

Hi, I''m doing some test on a network 10 gb nics and xen with version 3.1 i''m measuring 2.5 gb/sec from domU to an external physical machine with iperf. switching to 3.2 has reduced the measured performance to 40-50 Mb/sec. did anything change in the network interface? can someone help me? thanks _______________________________________________ Xen-users mailing list

Hi all I''m hacking on a netback trying to identify whether TLB flushes causes heavy performance penalty on Tx path. The hack is quite nasty (you would not want to know, trust me). Basically what is doesn''t is, 1) alter network protocol to pass along mfns instead of grant references, 2) when the backend sees a new mfn, map it RO and cache it in its own address space. With this

Hi Xen-users, I am trying to boot of my fist guest domain. The below attached message was thrown on the screen. I am not quite sure that the below information is sufficient to root cause the issue. Where do i look for additional logs to root cause the issue. Appreciate any info that you think might be useful. Thanks, Karthik xm create -c guest1.conf vmid=2 Using config file

I''ve been working form the netfront.c in the testing tree and using SLES 10 RC1 for i386 on a SMP box. When I stress the network using iperf in a domU, domU acting as client on a gigabit network, I occasionally get a panic at the dev_kfree_skb_irq(skb); line. This is the same panic as reported in http://lists.xensource.com/archives/html/xen-devel/2006-05/msg00919.html The trace

From: Tonghao Zhang <xiangxia.m.yue at gmail.com> Open vSwitch and Linux bridge will disable LRO of the interface when this interface added to them. Now when disable the LRO, the virtio-net csum is disable too. That drops the forwarding performance. Fixes: a02e8964eaf9 ("virtio-net: ethtool configurable LRO") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Jason Wang

From: Tonghao Zhang <xiangxia.m.yue at gmail.com> Open vSwitch and Linux bridge will disable LRO of the interface when this interface added to them. Now when disable the LRO, the virtio-net csum is disable too. That drops the forwarding performance. Fixes: a02e8964eaf9 ("virtio-net: ethtool configurable LRO") Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Jason Wang

hyperv_net: - set min/max_mtu, per Haiyang, after rndis_filter_device_add virtio_net: - set min/max_mtu - remove virtnet_change_mtu vmxnet3: - set min/max_mtu xen-netback: - min_mtu = 0, max_mtu = 65517 xen-netfront: - min_mtu = 0, max_mtu = 65535 unisys/visor: - clean up defines a little to not clash with network core or add redundat definitions CC: netdev at vger.kernel.org CC:

hyperv_net: - set min/max_mtu, per Haiyang, after rndis_filter_device_add virtio_net: - set min/max_mtu - remove virtnet_change_mtu vmxnet3: - set min/max_mtu xen-netback: - min_mtu = 0, max_mtu = 65517 xen-netfront: - min_mtu = 0, max_mtu = 65535 unisys/visor: - clean up defines a little to not clash with network core or add redundat definitions CC: netdev at vger.kernel.org CC:

Hi all, I need to transform classic 32bit Fortran code to 64bit Fortran code, see the discussion [R-SIG-Mac] rnorm.halton. But I'm clearly a beginner in Fortran... Does someone already do this for his package? From here, http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=linux&db=bks&fname=/SGI_Developer/Porting_Guide/ch03.html , I identify the following changes

There's no need for the guest to validate the checksum if it have been validated by host nics. So this patch introduces a new flag - VIRTIO_NET_HDR_F_DATA_VALID which is used to bypass the checksum examing in guest. The backend (tap/macvtap) may set this flag when met skbs with CHECKSUM_UNNECESSARY to save cpu utilization. No feature negotiation is needed as old driver just ignore this flag.

There's no need for the guest to validate the checksum if it have been validated by host nics. So this patch introduces a new flag - VIRTIO_NET_HDR_F_DATA_VALID which is used to bypass the checksum examing in guest. The backend (tap/macvtap) may set this flag when met skbs with CHECKSUM_UNNECESSARY to save cpu utilization. No feature negotiation is needed as old driver just ignore this flag.

I have installed xen on a node and while starting up a guest while in the kernel boot I am experiencing a hold/pause. The kernel stops in the boot sequence still loading the kernel at: stdout ... [ 3240.186441] xencons_init: Initializing xen vfb; pass xencons=tty to prevent this [ 3240.186538] Xen virtual console successfully installed as xvc0 [ 3240.186598] Event-channel device installed. [

Hi Ian, Today i fired up an old VM with a bittorrent client, trying to download some torrents. I seem to be hitting the unlikely case of "xennet: skb rides the rocket: xx slots" and this results in some dropped packets in domU, I don''t see any warnings in dom0. I have added some extra info, but i don''t have enough knowledge if this could/should be prevented from

hello, I tried using NAPI in pv network drivers, but i discovered that it don''t supports NAPI (kernel 3.5.0-17, xen 4.3.1). I like to know if any version of pv driver supports NAPI regards Eduardo _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users

When counting required slots for skb, netback directly uses DIV_ROUND_UP to get slots required by header data. This is wrong when offset in the page of header data is not zero, and is also inconsistent with following calculation for required slot in netbk_gop_skb. In netbk_gop_skb, required slots are calculated based on offset and len in page of header data. It is possible that required slots

On Jul 28, 2011, at 1:38 PM, Rose, Gregory V wrote: > >> From: Anirban Chakraborty [mailto:anirban.chakraborty at qlogic.com] >> Sent: Thursday, July 28, 2011 12:04 PM >> To: Rose, Gregory V >> Cc: David Miller; netdev; Ben Hutchings; Kirsher, Jeffrey T >> Subject: Re: [RFC net-next PATCH 3/4] ethtool: Add new set commands >> >> >> On Jul 28,

On Jul 28, 2011, at 1:38 PM, Rose, Gregory V wrote: > >> From: Anirban Chakraborty [mailto:anirban.chakraborty at qlogic.com] >> Sent: Thursday, July 28, 2011 12:04 PM >> To: Rose, Gregory V >> Cc: David Miller; netdev; Ben Hutchings; Kirsher, Jeffrey T >> Subject: Re: [RFC net-next PATCH 3/4] ethtool: Add new set commands >> >> >> On Jul 28,