From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: Re: [PATCH v2 net-next 3/4] vhost_net: Avoid rx queue wake-ups during busypoll Date: Wed, 4 Jul 2018 11:26:35 +0800 Message-ID: <1d96dc18-de3f-4974-4bc5-5390caf24779@redhat.com> References: <1530603094-2476-1-git-send-email-makita.toshiaki@lab.ntt.co.jp> <1530603094-2476-4-git-send-email-makita.toshiaki@lab.ntt.co.jp> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Cc: netdev@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org To: Toshiaki Makita , "David S. Miller" , "Michael S. Tsirkin" Return-path: In-Reply-To: <1530603094-2476-4-git-send-email-makita.toshiaki@lab.ntt.co.jp> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: netdev.vger.kernel.org CgpPbiAyMDE45bm0MDfmnIgwM+aXpSAxNTozMSwgVG9zaGlha2kgTWFraXRhIHdyb3RlOgo+IFdl IG1heSBydW4gaGFuZGxlX3J4KCkgd2hpbGUgcnggd29yayBpcyBxdWV1ZWQuIEZvciBleGFtcGxl IGEgcGFja2V0IGNhbgo+IHB1c2ggdGhlIHJ4IHdvcmsgZHVyaW5nIHRoZSB3aW5kb3cgYmVmb3Jl IGhhbmRsZV9yeCBjYWxscwo+IHZob3N0X25ldF9kaXNhYmxlX3ZxKCkuCj4gSW4gdGhhdCBjYXNl IGJ1c3lwb2xsIGltbWVkaWF0ZWx5IGV4aXRzIGR1ZSB0byB2aG9zdF9oYXNfd29yaygpCj4gY29u ZGl0aW9uIGFuZCBlbmFibGVzIHZxIGFnYWluLiBUaGlzIGNhbiBsZWFkIHRvIGFub3RoZXIgdW5u ZWNlc3NhcnkgcngKPiB3YWtlLXVwcywgc28gcG9sbCByeCB3b3JrIGluc3RlYWQgb2YgZW5hYmxp bmcgdGhlIHZxLgo+Cj4gU2lnbmVkLW9mZi1ieTogVG9zaGlha2kgTWFraXRhIDxtYWtpdGEudG9z aGlha2lAbGFiLm50dC5jby5qcD4KPiAtLS0KPiAgIGRyaXZlcnMvdmhvc3QvbmV0LmMgfCAyNiAr KysrKysrKysrKysrKysrKysrLS0tLS0tLQo+ICAgMSBmaWxlIGNoYW5nZWQsIDE5IGluc2VydGlv bnMoKyksIDcgZGVsZXRpb25zKC0pCj4KPiBkaWZmIC0tZ2l0IGEvZHJpdmVycy92aG9zdC9uZXQu YyBiL2RyaXZlcnMvdmhvc3QvbmV0LmMKPiBpbmRleCA4MTFjMGU1Li43OTFiYzhiIDEwMDY0NAo+ IC0tLSBhL2RyaXZlcnMvdmhvc3QvbmV0LmMKPiArKysgYi9kcml2ZXJzL3Zob3N0L25ldC5jCj4g QEAgLTY1Myw3ICs2NTMsOCBAQCBzdGF0aWMgdm9pZCB2aG9zdF9yeF9zaWduYWxfdXNlZChzdHJ1 Y3Qgdmhvc3RfbmV0X3ZpcnRxdWV1ZSAqbnZxKQo+ICAgCW52cS0+ZG9uZV9pZHggPSAwOwo+ICAg fQo+ICAgCj4gLXN0YXRpYyBpbnQgdmhvc3RfbmV0X3J4X3BlZWtfaGVhZF9sZW4oc3RydWN0IHZo b3N0X25ldCAqbmV0LCBzdHJ1Y3Qgc29jayAqc2spCj4gK3N0YXRpYyBpbnQgdmhvc3RfbmV0X3J4 X3BlZWtfaGVhZF9sZW4oc3RydWN0IHZob3N0X25ldCAqbmV0LCBzdHJ1Y3Qgc29jayAqc2ssCj4g KwkJCQkgICAgICBib29sICpidXN5bG9vcF9pbnRyKQo+ICAgewo+ICAgCXN0cnVjdCB2aG9zdF9u ZXRfdmlydHF1ZXVlICpybnZxID0gJm5ldC0+dnFzW1ZIT1NUX05FVF9WUV9SWF07Cj4gICAJc3Ry dWN0IHZob3N0X25ldF92aXJ0cXVldWUgKnRudnEgPSAmbmV0LT52cXNbVkhPU1RfTkVUX1ZRX1RY XTsKPiBAQCAtNjcxLDExICs2NzIsMTYgQEAgc3RhdGljIGludCB2aG9zdF9uZXRfcnhfcGVla19o ZWFkX2xlbihzdHJ1Y3Qgdmhvc3RfbmV0ICpuZXQsIHN0cnVjdCBzb2NrICpzaykKPiAgIAkJcHJl ZW1wdF9kaXNhYmxlKCk7Cj4gICAJCWVuZHRpbWUgPSBidXN5X2Nsb2NrKCkgKyB0dnEtPmJ1c3ls b29wX3RpbWVvdXQ7Cj4gICAKPiAtCQl3aGlsZSAodmhvc3RfY2FuX2J1c3lfcG9sbChlbmR0aW1l KSAmJgo+IC0JCSAgICAgICAhdmhvc3RfaGFzX3dvcmsoJm5ldC0+ZGV2KSAmJgo+IC0JCSAgICAg ICAhc2tfaGFzX3J4X2RhdGEoc2spICYmCj4gLQkJICAgICAgIHZob3N0X3ZxX2F2YWlsX2VtcHR5 KCZuZXQtPmRldiwgdHZxKSkKPiArCQl3aGlsZSAodmhvc3RfY2FuX2J1c3lfcG9sbChlbmR0aW1l KSkgewo+ICsJCQlpZiAodmhvc3RfaGFzX3dvcmsoJm5ldC0+ZGV2KSkgewo+ICsJCQkJKmJ1c3ls b29wX2ludHIgPSB0cnVlOwo+ICsJCQkJYnJlYWs7Cj4gKwkJCX0KPiArCQkJaWYgKHNrX2hhc19y eF9kYXRhKHNrKSB8fAo+ICsJCQkgICAgIXZob3N0X3ZxX2F2YWlsX2VtcHR5KCZuZXQtPmRldiwg dHZxKSkKPiArCQkJCWJyZWFrOwo+ICAgCQkJY3B1X3JlbGF4KCk7Cj4gKwkJfQo+ICAgCj4gICAJ CXByZWVtcHRfZW5hYmxlKCk7Cj4gICAKPiBAQCAtNzk1LDYgKzgwMSw3IEBAIHN0YXRpYyB2b2lk IGhhbmRsZV9yeChzdHJ1Y3Qgdmhvc3RfbmV0ICpuZXQpCj4gICAJczE2IGhlYWRjb3VudDsKPiAg IAlzaXplX3Qgdmhvc3RfaGxlbiwgc29ja19obGVuOwo+ICAgCXNpemVfdCB2aG9zdF9sZW4sIHNv Y2tfbGVuOwo+ICsJYm9vbCBidXN5bG9vcF9pbnRyID0gZmFsc2U7Cj4gICAJc3RydWN0IHNvY2tl dCAqc29jazsKPiAgIAlzdHJ1Y3QgaW92X2l0ZXIgZml4dXA7Cj4gICAJX192aXJ0aW8xNiBudW1f YnVmZmVyczsKPiBAQCAtODE4LDcgKzgyNSw5IEBAIHN0YXRpYyB2b2lkIGhhbmRsZV9yeChzdHJ1 Y3Qgdmhvc3RfbmV0ICpuZXQpCj4gICAJCXZxLT5sb2cgOiBOVUxMOwo+ICAgCW1lcmdlYWJsZSA9 IHZob3N0X2hhc19mZWF0dXJlKHZxLCBWSVJUSU9fTkVUX0ZfTVJHX1JYQlVGKTsKPiAgIAo+IC0J d2hpbGUgKChzb2NrX2xlbiA9IHZob3N0X25ldF9yeF9wZWVrX2hlYWRfbGVuKG5ldCwgc29jay0+ c2spKSkgewo+ICsJd2hpbGUgKChzb2NrX2xlbiA9IHZob3N0X25ldF9yeF9wZWVrX2hlYWRfbGVu KG5ldCwgc29jay0+c2ssCj4gKwkJCQkJCSAgICAgICZidXN5bG9vcF9pbnRyKSkpIHsKPiArCQli dXN5bG9vcF9pbnRyID0gZmFsc2U7Cj4gICAJCXNvY2tfbGVuICs9IHNvY2tfaGxlbjsKPiAgIAkJ dmhvc3RfbGVuID0gc29ja19sZW4gKyB2aG9zdF9obGVuOwo+ICAgCQloZWFkY291bnQgPSBnZXRf cnhfYnVmcyh2cSwgdnEtPmhlYWRzICsgbnZxLT5kb25lX2lkeCwKPiBAQCAtOTA1LDcgKzkxNCwx MCBAQCBzdGF0aWMgdm9pZCBoYW5kbGVfcngoc3RydWN0IHZob3N0X25ldCAqbmV0KQo+ICAgCQkJ Z290byBvdXQ7Cj4gICAJCX0KPiAgIAl9Cj4gLQl2aG9zdF9uZXRfZW5hYmxlX3ZxKG5ldCwgdnEp Owo+ICsJaWYgKHVubGlrZWx5KGJ1c3lsb29wX2ludHIpKQo+ICsJCXZob3N0X3BvbGxfcXVldWUo JnZxLT5wb2xsKTsKPiArCWVsc2UKPiArCQl2aG9zdF9uZXRfZW5hYmxlX3ZxKG5ldCwgdnEpOwo+ ICAgb3V0Ogo+ICAgCXZob3N0X3J4X3NpZ25hbF91c2VkKG52cSk7Cj4gICAJbXV0ZXhfdW5sb2Nr KCZ2cS0+bXV0ZXgpOwoKQWNrZWQtYnk6IEphc29uIFdhbmcgPGphc293YW5nQHJlZGhhdC5jb20+ CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpWaXJ0dWFs aXphdGlvbiBtYWlsaW5nIGxpc3QKVmlydHVhbGl6YXRpb25AbGlzdHMubGludXgtZm91bmRhdGlv bi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlzdGluZm8v dmlydHVhbGl6YXRpb24=