From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Dunlap Subject: Re: Xen on ARM IRQ latency and scheduler overhead Date: Mon, 20 Feb 2017 11:04:37 +0000 Message-ID: References: <1487356845.6732.100.camel@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" To: Stefano Stabellini , Dario Faggioli Cc: george.dunlap@eu.citrix.com, edgar.iglesias@xilinx.com, julien.grall@arm.com, xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org T24gMTgvMDIvMTcgMDA6NDEsIFN0ZWZhbm8gU3RhYmVsbGluaSB3cm90ZToKPiBPbiBGcmksIDE3 IEZlYiAyMDE3LCBEYXJpbyBGYWdnaW9saSB3cm90ZToKPj4gT24gVGh1LCAyMDE3LTAyLTA5IGF0 IDE2OjU0IC0wODAwLCBTdGVmYW5vIFN0YWJlbGxpbmkgd3JvdGU6Cj4+PiBUaGVzZSBhcmUgdGhl IHJlc3VsdHMsIGluIG5hbm9zZWM6Cj4+Pgo+Pj4gICAgICAgICAgICAgICAgICAgICAgICAgQVZH ICAgICBNSU4gICAgIE1BWCAgICAgV0FSTSBNQVgKPj4+Cj4+PiBOT0RFQlVHIG5vIFdGSSAgICAg ICAgICAxODkwICAgIDE4MDAgICAgMzE3MCAgICAyMDcwCj4+PiBOT0RFQlVHIFdGSSAgICAgICAg ICAgICA0ODUwICAgIDQ4MTAgICAgNzAzMCAgICA0OTgwCj4+PiBOT0RFQlVHIG5vIFdGSSBjcmVk aXQyICAyMjE3ICAgIDIwOTAgICAgMzQyMCAgICAyNjUwCj4+PiBOT0RFQlVHIFdGSSBjcmVkaXQy ICAgICA4MDgwICAgIDc4OTAgICAgMTAzMjAgICA4MzAwCj4+Pgo+Pj4gREVCVUcgbm8gV0ZJICAg ICAgICAgICAgMjI1MiAgICAyMDgwICAgIDMzMjAgICAgMjY1MAo+Pj4gREVCVUcgV0ZJICAgICAg ICAgICAgICAgNjUwMCAgICA2MTQwICAgIDg1MjAgICAgODEzMAo+Pj4gREVCVUcgV0ZJLCBjcmVk aXQyICAgICAgODA1MCAgICA3ODcwICAgIDEwNjgwICAgODQ1MAo+Pj4KPj4+IEFzIHlvdSBjYW4g c2VlLCBkZXBlbmRpbmcgb24gd2hldGhlciB0aGUgZ3Vlc3QgaXNzdWVzIGEgV0ZJIG9yIG5vdAo+ Pj4gd2hpbGUKPj4+IHdhaXRpbmcgZm9yIGludGVycnVwdHMsIHRoZSByZXN1bHRzIGNoYW5nZSBz aWduaWZpY2FudGx5Lgo+Pj4gSW50ZXJlc3RpbmdseSwKPj4+IGNyZWRpdDIgZG9lcyB3b3JzZSB0 aGFuIGNyZWRpdDEgaW4gdGhpcyBhcmVhLgo+Pj4KPj4gSSBkaWQgc29tZSBtZWFzdXJpbmcgbXlz ZWxmLCBvbiB4ODYsIHdpdGggZGlmZmVyZW50IHRvb2xzLiBTbywKPj4gY3ljbGljdGVzdCBpcyBi YXNpY2FsbHkgc29tZXRoaW5nIHZlcnkgdmVyeSBzaW1pbGFyIHRvIHRoZSBhcHAKPj4gU3RlZmFu bydzIGFwcC4KPj4KPj4gSSd2ZSBydW4gaXQgYm90aCB3aXRoaW4gRG9tMCwgYW5kIGluc2lkZSBh IGd1ZXN0LiBJIGFsc28gcnVuIGEgWGVuCj4+IGJ1aWxkIChpbiB0aGlzIGNhc2UsIG9ubHkgaW5z aWRlIG9mIHRoZSBndWVzdCkuCj4+Cj4+PiBXZSBhcmUgZG93biB0byAyMDAwLTMwMDBucy4gVGhl biwgSSBzdGFydGVkIGludmVzdGlnYXRpbmcgdGhlCj4+PiBzY2hlZHVsZXIuCj4+PiBJIG1lYXN1 cmVkIGhvdyBsb25nIGl0IHRha2VzIHRvIHJ1biAidmNwdV91bmJsb2NrIjogMTA1MG5zLCB3aGlj aCBpcwo+Pj4gc2lnbmlmaWNhbnQuIEkgZG9uJ3Qga25vdyB3aGF0IGlzIGNhdXNpbmcgdGhlIHJl bWFpbmluZyAxMDAwLTIwMDBucywKPj4+IGJ1dAo+Pj4gSSBiZXQgb24gYW5vdGhlciBzY2hlZHVs ZXIgZnVuY3Rpb24uIERvIHlvdSBoYXZlIGFueSBzdWdnZXN0aW9ucyBvbgo+Pj4gd2hpY2ggb25l Pwo+Pj4KPj4gU28sIHZjcHVfdW5ibG9jaygpIGNhbGxzIHZjcHVfd2FrZSgpLCB3aGljaCB0aGVu IGludm9rZXMgdGhlCj4+IHNjaGVkdWxlcidzIHdha2V1cCByZWxhdGVkIGZ1bmN0aW9ucy4KPj4K Pj4gSWYgeW91IHRpbWUgdmNwdV91bmJsb2NrKCksIGZyb20gYmVnaW5uaW5nIHRvIGVuZCBvZiB0 aGUgZnVuY3Rpb24sIHlvdQo+PiBhY3R1YWxseSBjYXB0dXJlIHF1aXRlIGEgZmV3IHRoaW5ncy4g RS5nLiwgdGhlIHNjaGVkdWxlciBsb2NrIGlzIHRha2VuCj4+IGluc2lkZSB2Y3B1X3dha2UoKSwg c28geW91J3JlIGJhc2ljYWxseSBpbmNsdWRpbmcgdGltZSBzcGVudCB3YWl0ZWQgb24KPj4gdGhl IGxvY2sgaW4gdGhlIGVzdGltYXRpb24uCj4+Cj4+IFRoYXQgaXMgcHJvYmFibHkgb2sgKGFzIGlu LCBsb2NrIGNvbnRlbnRpb24gZGVmaW5pdGVseSBpcyBzb21ldGhpbmcKPj4gcmVsZXZhbnQgdG8g bGF0ZW5jeSksIGJ1dCBpdCBpcyBleHBlY3RlZCBmb3IgdGhpbmdzIHRvIGJlIHJhdGhlcgo+PiBk aWZmZXJlbnQgYmV0d2VlbiBDcmVkaXQxIGFuZCBDcmVkaXQyLgo+Pgo+PiBJJ3ZlLCBPVE9ILCB0 cmllZCB0byB0aW1lLCBTQ0hFRF9PUCh3YWtlKSBhbmQgU0NIRURfT1AoZG9fc2NoZWR1bGUpLAo+ PiBhbmQgaGVyZSdzIHRoZSByZXN1bHQuIE51bWJlcnMgYXJlIGluIGN5Y2xlcyAoSSd2ZSB1c2Vk IFJEVFNDKSBhbmQsIGZvcgo+PiBtYWtpbmcgc3VyZSB0byBvYnRhaW4gY29uc2lzdGVudCBhbmQg Y29tcGFyYWJsZSBudW1iZXJzLCBJJ3ZlIHNldCB0aGUKPj4gZnJlcXVlbmN5IHNjYWxpbmcgZ292 ZXJub3IgdG8gcGVyZm9ybWFuY2UuCj4+Cj4+IERvbTAsIFtwZXJmb3JtYW5jZV0JCQkJCQkJCj4+ IAkgICAgICAgIGN5Y2xpY3Rlc3QgMXVzCWN5Y2xpY3Rlc3QgMW1zCWN5Y2xpY3Rlc3QgMTAwbXMJ CQkKPj4gKGN5Y2xlcykJQ3JlZGl0MQlDcmVkaXQyCUNyZWRpdDEJQ3JlZGl0MglDcmVkaXQxCUNy ZWRpdDIJCQo+PiB3YWtldXAtYXZnCTI0MjkJMjAzNQkxOTgwCTE2MzMJMjUzNQkxOTc5CQkKPj4g d2FrZXVwLW1heAkxNDU3NwkxMTM2ODIJMTUxNTMJMjAzMTM2CTEyMjg1CTExNTE2NAkJCj4gCj4g SSBhbSBub3QgdGhhdCBmYW1pbGlhciB3aXRoIHRoZSB4ODYgc2lkZSBvZiB0aGluZ3MsIGJ1dCB0 aGUgMTEzNjgyIGFuZAo+IDIwMzEzNiBsb29rIHdvcnJpc29tZSwgZXNwZWNpYWxseSBjb25zaWRl cmluZyB0aGF0IGNyZWRpdDEgZG9lc24ndCBoYXZlCj4gdGhlbS4KCkRhcmlvLAoKRG8geW91IHJl Y2tvbiB0aG9zZSAnTUFYJyB2YWx1ZXMgY291bGQgYmUgdGhlIGxvYWQgYmFsYW5jZXIgcnVubmlu ZwooYm90aCBmb3IgY3JlZGl0MSBhbmQgY3JlZGl0Mik/CgogLUdlb3JnZQoKCl9fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fClhlbi1kZXZlbCBtYWlsaW5nIGxp c3QKWGVuLWRldmVsQGxpc3RzLnhlbi5vcmcKaHR0cHM6Ly9saXN0cy54ZW4ub3JnL3hlbi1kZXZl bAo=