From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: Re: [PATCH vhost] vhost_net: Fix too many vring kick on busypoll Date: Mon, 2 Jul 2018 11:05:38 +0800 Message-ID: <862f8999-1e03-e7e7-ad23-be0360abf51d@redhat.com> References: <1530259790-2414-1-git-send-email-makita.toshiaki@lab.ntt.co.jp> <20180629193448-mutt-send-email-mst@kernel.org> 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 , "Michael S. Tsirkin" Return-path: In-Reply-To: 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 CgpPbiAyMDE45bm0MDfmnIgwMuaXpSAxMDo1MiwgVG9zaGlha2kgTWFraXRhIHdyb3RlOgo+IE9u IDIwMTgvMDcvMDIgMTE6NDEsIEphc29uIFdhbmcgd3JvdGU6Cj4+IE9uIDIwMTjlubQwNuaciDMw 5pelIDAwOjM4LCBNaWNoYWVsIFMuIFRzaXJraW4gd3JvdGU6Cj4+PiBPbiBGcmksIEp1biAyOSwg MjAxOCBhdCAwNTowOTo1MFBNICswOTAwLCBUb3NoaWFraSBNYWtpdGEgd3JvdGU6Cj4+Pj4gVW5k ZXIgaGVhdnkgbG9hZCB2aG9zdCBidXN5cG9sbCBtYXkgcnVuIHdpdGhvdXQgc3VwcHJlc3NpbmcK Pj4+PiBub3RpZmljYXRpb24uIEZvciBleGFtcGxlIHR4IHplcm9jb3B5IGNhbGxiYWNrIGNhbiBw dXNoIHR4IHdvcmsgd2hpbGUKPj4+PiBoYW5kbGVfdHgoKSBpcyBydW5uaW5nLCB0aGVuIGJ1c3ls b29wIGV4aXRzIGR1ZSB0byB2aG9zdF9oYXNfd29yaygpCj4+Pj4gY29uZGl0aW9uIGFuZCBlbmFi bGVzIG5vdGlmaWNhdGlvbiBidXQgaW1tZWRpYXRlbHkgcmVlbnRlcnMgaGFuZGxlX3R4KCkKPj4+ PiBiZWNhdXNlIHRoZSBwdXNoZWQgd29yayB3YXMgdHguIEluIHRoaXMgY2FzZSBoYW5kbGVfdHgo KSB0cmllcyB0bwo+Pj4+IGRpc2FibGUgbm90aWZpY2F0aW9uIGFnYWluLCBidXQgd2hlbiB1c2lu ZyBldmVudF9pZHggaXQgYnkgZGVzaWduCj4+Pj4gY2Fubm90LiBUaGVuIGJ1c3lsb29wIHdpbGwg cnVuIHdpdGhvdXQgc3VwcHJlc3Npbmcgbm90aWZpY2F0aW9uLgo+Pj4+IEFub3RoZXIgZXhhbXBs ZSBpcyB0aGUgY2FzZSB3aGVyZSBoYW5kbGVfdHgoKSB0cmllcyB0byBlbmFibGUKPj4+PiBub3Rp ZmljYXRpb24gYnV0IGF2YWlsIGlkeCBpcyBhZHZhbmNlZCBzbyBkaXNhYmxlcyBpdCBhZ2Fpbi4g VGhpcyBjYXNlCj4+Pj4gYWxzbyBsZWFkIHRvIHRoZSBzYW1lIHNpdHVhdGlvbiB3aXRoIGV2ZW50 X2lkeC4KPj4+Pgo+Pj4+IFRoZSBwcm9ibGVtIGlzIHRoYXQgb25jZSB3ZSBlbnRlciB0aGlzIHNp dHVhdGlvbiBidXN5bG9vcCBkb2VzIG5vdCB3b3JrCj4+Pj4gdW5kZXIgaGVhdnkgbG9hZCBmb3Ig Y29uc2lkZXJhYmxlIGFtb3VudCBvZiB0aW1lLCBiZWNhdXNlIG5vdGlmaWNhdGlvbgo+Pj4+IGlz IGxpa2VseSB0byBoYXBwZW4gZHVyaW5nIGJ1c3lsb29wIGFuZCBoYW5kbGVfdHgoKSBpbW1lZGlh dGVseSBlbmFibGVzCj4+Pj4gbm90aWZpY2F0aW9uIGFmdGVyIG5vdGlmaWNhdGlvbiBoYXBwZW5z LiBTcGVjaWZpY2FsbHkgYnVzeWxvb3AgZGV0ZWN0cwo+Pj4+IG5vdGlmaWNhdGlvbiBieSB2aG9z dF9oYXNfd29yaygpIGFuZCB0aGVuIGhhbmRsZV90eCgpIGNhbGxzCj4+Pj4gdmhvc3RfZW5hYmxl X25vdGlmeSgpLgo+Pj4gSSdkIGxpa2UgdG8gdW5kZXJzdGFuZCB0aGUgcHJvYmxlbSBhIGJpdCBi ZXR0ZXIuCj4+PiBXaHkgZG9lcyB0aGlzIGhhcHBlbj8KPj4+IERvZXNuJ3QgdGhpcyBvbmx5IGhh cHBlbiBpZiByaW5nIGlzIGVtcHR5Pwo+Pj4KPj4gTXkgdW5kZXJzdGFuZGluZyBpczoKPj4KPj4g dmhvc3RfemVyb2NvcHlfY2FsbGJhY2soKSB0cnkgdG8gcG9sbCB2aG9zdCB2aXJ0cXVldWUuIFRo aXMgd2lsbCBjYXVzZQo+PiB0aGUgYnVzeSBsb29wIGluIHZob3N0X25ldF90eF9nZXRfdnFfZGVz YygpIHRvIGV4aXQgYmVjYXVzZSBvZgo+PiB2aG9zdF9oYXNfd29yaygpIHJldHVybiB0cnVlLiBU aGVuIGhhbmRsZV90eCgpIHRlbmRzIHRvIGVuYWJsZQo+PiBub3RpZmljYXRpb24uIFRoZW4gZ3Vl c3QgbWF5IGtpY2sgdXMgZXZlbiBpZiBoYW5kbGVfdHgoKSBjYWxsCj4+IHZob3N0X2Rpc2FibGVf bm90aWZ5KCkgd2hpY2ggaW4gZmFjdCBkaWQgbm90aGluZyBmb3IgZXZlbiBpbmRleC4KPiBZZXMu Cj4KPj4gTWF5YmUgd2UgY2FuIHRyeSB0byBjYWxsIHZob3N0X3plcm9jb3B5X3NpZ25hbF91c2Vk KCkgaWYgd2UgZm91bmQKPj4gdGhlcmUncyBwZW5kaW5nIHVzZWQgZnJvbSB6ZXJvY29weSBpbnN0 ZWFkLgo+IE5vdGUgdGhhdCBldmVuIHdoZW4gemVyb2NvcHkgaXMgZGlzYWJsZWQgdGhlIHByb2Js ZW0gaGFwcGVucyBhcyBJIHdyb3RlLgo+IFdoZW4gdmhvc3RfZW5hYmxlX25vdGlmeSgpIGRldGVj dHMgYXZhaWxfaWR4IGFkdmFuY2VkIGl0IHRyaWVzIHRvCj4gZGlzYWJsZSBub3RpZmljYXRpb24g YWdhaW4gYnV0IGl0IGZhaWxzLgo+CgpZZXMsIGFuZCB0aGUgbWFpbiByZWFzb24gaXMgbmVlZF9y ZXNjaGVkKCkgYW5kIHJ4IHdvcmsuIChwb2xsaW5nIFJYIHdpbGwgCmJlIGFkZHJlc3NlZCBieSBU b25naGFvJ3MgcGF0Y2ggSSB0aGluaykuCgpUaGFua3MKX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX18KVmlydHVhbGl6YXRpb24gbWFpbGluZyBsaXN0ClZpcnR1 YWxpemF0aW9uQGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnCmh0dHBzOi8vbGlzdHMubGludXhm b3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL3ZpcnR1YWxpemF0aW9u