From mboxrd@z Thu Jan  1 00:00:00 1970
From: John.C.Harrison@Intel.com
Subject: [RFC 0/2] Excessive latency in GuC send action
Date: Fri, 17 Nov 2017 16:39:32 -0800
Message-ID: <20171118003934.4800-1-John.C.Harrison@Intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
Received: from mga02.intel.com (mga02.intel.com [134.134.136.20])
 by gabe.freedesktop.org (Postfix) with ESMTPS id CF7A26E4BD
 for <Intel-GFX@lists.freedesktop.org>; Sat, 18 Nov 2017 00:39:35 +0000 (UTC)
List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <https://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <https://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Errors-To: intel-gfx-bounces@lists.freedesktop.org
Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org>
To: Intel-GFX@Lists.FreeDesktop.Org
Cc: Winiarski@freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

RnJvbTogSm9obiBIYXJyaXNvbiA8Sm9obi5DLkhhcnJpc29uQEludGVsLmNvbT4KCldoaWxlIHdv
cmtpbmcgb24gYSBjdXN0b21lciBwcm9qZWN0LCBpdCB3YXMgbm90aWNlZCB0aGF0IHRoZSB0aW1l
CnRha2VuIHRvIGlzc3VlIGEgcHJlLWVtcHRpb24gcmVxdWVzdCB0byB0aGUgR3VDIHdvdWxkIHZh
cnkgcXVpdGUKc2lnbmlmaWNhbnRseS4gVGhlIGNvcnJlY3QgY2FzZSB3YXMgbG93IG1pY3Jvc2Vj
b25kcyBidXQgdGhlIHdvcnN0CmNhc2Ugd2FzIHRlbnMgb2YgbWlsbGlzZWNvbmRzLiBUd28gc2Vw
YXJhdGUgaXNzdWVzIHdlcmUgaWRlbnRpZmllZCBhcwpjYXVzaW5nIHRoaXMgZXh0cmEgZGVsYXku
IFRoZSBhY3F1aXNpdGlvbiBvZiB0aGUgR3VDIHNlbmQgbXV0ZXggbG9jawphbmQgdGhlIHN0YWxs
IHdhaXRpbmcgZm9yIGFuIGFjayBmcm9tIHRoZSBHdUMuIEJvdGggb2YgdGhlc2UgYXJlCm5lY2Vz
c2FyeSBzdGVwcyBiZWNhdXNlIHRoZSBhY2Nlc3MgdG8gdGhlIHNlbmQgYWN0aW9uIG1lY2hhbmlz
bSBtdXN0CmJlIHNlcmlhbGlzZWQuIEl0IGlzIG5vdCBkZXNpZ25lZCBmb3IgbXVsdGlwbGUgY29u
Y3VycmVudCBvcGVyYXRpb25zLgoKTXV0ZXggTG9jayBEZWxheToKVGhlIGZpcnN0IGlzc3VlIHNl
ZW1zIHRvIGJlIHdpdGggdGhlIHdheSBtdXRleF9sb2NrKCkgaXRzZWxmIGlzCmltcGxlbWVudGVk
IGluIHRoZSBsaW51eCBrZXJuZWwuIEV2ZW4gd2hlbiB0aGUgbG9jayBpcyBhdmFpbGFibGUsIGl0
CnNlZW1zIHRoYXQgbGludXggc29tZXRpbWVzIGRlY2lkZXMgdG8gZG8gYSB0YXNrIHN3aXRjaCBh
bnl3YXkgYW5kIG5vdApyZS1zY2hlZHVsZSB0aGUgdGhyZWFkIHRoYXQgcmVxdWVzdGVkIHRoZSBs
b2NrIGZvciBzb21lIHRpbWUuIEhlbmNlCnRoZSB0aW1lIHRha2VuIHRvIGFjcXVpcmUgdGhlIG11
dGV4IGxvY2sgd291bGQgZ2VuZXJhbGx5IGJlCmVzc2VudGlhbGx5IHplcm8gYnV0IGluIGFyb3Vu
ZCAwLjA1JSBvZiBjYXNlcyBpdCB3b3VsZCBiZSBpbiB0aGUKNi0xMG1zIHJhbmdlLiBOb3RlIHRo
YXQgdGhlcmUgd2FzIG5ldmVyIGFueSBhY3R1YWwgY29udGVudGlvbiBvZiB0aGUKbXV0ZXggb2Jz
ZXJ2ZWQuIEluIGFsbCBjYXNlcywgdGhlIG11dGV4IHdhcyBhdmFpbGFibGUuCgpUaGUgd29ya2Fy
b3VuZCBpbXBsZW1lbnRlZCBmb3IgdGhlIGN1c3RvbWVyIHdhcyB0byBmaXJzdCB1c2UgYQptdXRl
eF90cnlsb2NrKCkuIElmIHRoZSB0cnkgZmFpbHMgdGhlbiBpdCBmYWxscyBiYWNrIHRvIHRoZSBy
ZWd1bGFyCm11dGV4X2xvY2soKSBjYWxsIGluc3RlYWQuIEFzIHRoZSB0cnkgbG9jayBpcyBub3Qg
cGVybWl0dGVkIHRvIHN0YWxsLAppdCBuZXZlciBoaXRzIHRoZSByYW5kb20gbGludXggdGFzayBz
d2l0Y2ggaXNzdWUuIFJ1bm5pbmcgb3Zlcm5pZ2h0LAozLjIgbWlsbGlvbiBwcmUtZW1wdGlvbiBl
dmVudHMgd2VyZSBsb2dnZWQgd2l0aCBub3QgYSBzaW5nbGUgbXV0ZXgKZGVsYXkgb3ZlciAxMCBt
aWNyb3NlY29uZHMgKHdoaWNoIHdhcyB0aGUgZ3JhbnVsYXJpdHkgb2YgdGhlCm1lYXN1cmVtZW50
IGJlaW5nIHVzZWQpLgoKQWNrIERlbGF5OgpUaGUgc2Vjb25kIGlzc3VlIHdhcyB3aXRoIHRoZSB3
YWl0IGZvciB0aGUgR3VDIGFja25vd2xlZGdtZW50IG9mIHRoZQpzZW5kIGFjdGlvbiBjb21tYW5k
LiBJbiBtb3N0IGNhc2VzLCBubyBkZWxheSBpcyByZXF1aXJlZCAtIHRoZQpjb21wbGV0aW9uIGZs
YWcgaXMgc2V0IGJ5IHRoZSB0aW1lIG9mIHRoZSBmaXJzdCByZWFkLiBIb3dldmVyLCBhcm91bmQK
MSUgb2YgdGhlIHRpbWUgdGhlIGZsYWcgd2FzIG5vdCBzZXQgYW5kIHRoZSB3YWl0X2ZvcigpIGxv
b3AgdGhlbiB0b29rCmluIHRoZSByZWdpb24gb2YgOC0xMG1zIHRvIHJldHVybi4gQW5hbHlzaXMg
c2hvd2VkIHRoYXQgdGhpcyBkZWxheSB3YXMKYWxzbyBlbnRpcmVseSBkdWUgdG8gdGhlIGxpbnV4
IGtlcm5lbCB0YXNrIHN3aXRjaGluZyBhd2F5IGR1ZSB0byB1c2luZwphIHNsZWVwaW5nIHdhaXQg
aW4gdGhlIHBvbGxpbmcgbG9vcC4gVXNpbmcgYSBub24tc2xlZXBpbmcgd2FpdCBicm91Z2h0CnRo
ZSBsYXRlbmN5IGRvd24gdG8gdGhlIDEwLTIwdXMgcmFuZ2UgaW4gdGhlIG1ham9yaXR5IG9mICdz
bG93JyBjYXNlcy4KQ2VydGFpbiB0ZXN0cyBoYWQgYSBub3RpY2VhYmxlIHNwaWtlIG9mIGFib3V0
IDEyMHVzLCBwcmVzdW1hYmx5IHdoZW4KdGhlIGRlbGF5IHdhcyBhY3R1YWxseSBkdWUgdG8gdGhl
IEd1QyBiZWluZyBidXN5LiBUaGUgd29yc2UgZXh0cmVtZXMKbWVhc3VyZWQgd2VyZSBhcm91bmQg
MjAwdXMsIHdpdGggbWF5YmUgb25lIG9yIHR3byBoaXRzIG9mIDMwMHVzIGluIGFuCm92ZXJuaWdo
dCBydW4uCgpUaGUgcG9sbGluZyBjb25zdHJ1Y3QgYmVpbmcgdXNlZCB3YXMgYSAnd2FpdF9mb3Jf
dXMoKScgb2YgMTAKbWljcm9zZWNvbmRzIChzcGlubmluZyBwb2xsKSBmb2xsb3dlZCBieSBhICd3
YWl0X2ZvcigpJyBvZiAxMG1zCihzbGVlcGluZyBwb2xsKSB3aXRoIHRoZSBmaW5hbCBmYWxsIGJh
Y2sgYmVpbmcgdG8gZ2l2ZSB1cCBhbmQgcmV0dXJuCmFuIGVycm9yLiBBcyB0aGUgY29tbWFuZCBx
dWl0ZSBmcmVxdWVudGx5IHRha2VzIGp1c3Qgb3ZlciAxMHVzIHRvCmNvbXBsZXRlLCB0aGlzIG1l
YW50IHRoZSBjb2RlIHdvdWxkIHJlZ3VsYXJseSBkcm9wIGludG8gdGhlIHNlY29uZApsb29wLiBE
ZXNwaXRlIHRoZSBzbGVlcCB0aW1lIGJlaW5nIHNldCBmb3IgMW1zLCBpdCB3b3VsZCBhY3R1YWxs
eQpzbGVlcCBmb3IgYW4gYXZlcmFnZSBvZiAxLjVtcyBhbmQgYXMgbm90ZWQgd291bGQgY29tbW9u
bHkgaGl0IGNsb3Nlcgp0byAxMG1zLgoKVGhlIHdvcmthcm91bmQgd2FzIHRvIGV4dGVuZCB0aGUg
YnVzeSBwb2xsIHBlcmlvZCB0byAxMDB1cyBpbiB0aGUgY2FzZQpvZiBhIHByZS1lbXB0aW9uIHJl
cXVlc3QuIEluIHRoZSBjYXNlIG9mIGFueSBvdGhlciBHdUMgc2VuZCBhY3Rpb24KY29tbWFuZCwg
dGhlIG9yaWdpbmFsIDEwdXMgd2FzIGtlcHQuIFRoZSByZWFzb25pbmcgYmVpbmcgdGhhdCBhCnBy
ZS1lbXB0aW9uIHJlcXVlc3QgaXMgYSB2ZXJ5IGhpZ2ggcHJpb3JpdHksIHVyZ2VudCB0aGluZyBh
bmQgaXMgd29ydGgKYnVybmluZyB0aGUgZXh0cmEgQ1BVIGN5Y2xlcyBvbiBhIGJ1c3kgcG9sbCBp
biBvcmRlciB0byBndWFyYW50ZWUgYQpzdWl0YWJseSBzbWFsbCBsYXRlbmN5LiBXaGVyZWFzLCB0
aGUgb3RoZXIgc2VuZCBhY3Rpb24gY29tbWFuZHMgYXJlCm5vdCBwZXJmb3JtYW5jZSBjcml0aWNh
bCBhbmQgYSBsb25nZXIgYnV0IG1vcmUgc3lzdGVtIGZyaWVuZGx5IHNsZWVwCmlzIG5vdCBhbiBp
c3N1ZS4KCgpOb3RlIHRoYXQgdGhlIHR3byBwYXRjaGVzIGluY2x1ZGVkIGhlcmUgYXJlIGJhc2Vk
IGFnYWluc3QgdGhlCmN1c3RvbWVyJ3MgNC4xMSB0cmVlLiBTbyB0aGV5IG1pZ2h0IG5vdCBhcHBs
eSB0b28gd2VsbCB0aGUgY3VycmVudAp1cHN0cmVhbSBwcmUtZW1wdGlvbiBpbXBsZW1lbnRhdGlv
bi4gSXQgd2FzIG5vdGVkIHRoYXQgYSByZWNlbnQgdXBkYXRlCnRvIHRoZSBnZW1fZXhlY19sYXRl
bmN5IElHVCBzaG93ZWQgImFkZGl0aW9uYWwgbGF0ZW5jeSBpbiB0aGUgbXV0ZXgKZm9yIGd1YyBw
cmVlbXB0aW9uIi4gV2hpY2ggc291bmRzIGxpa2UgdGhlIHNhbWUgaXNzdWUgdGhhdCB3YXMgc2Vl
bgpoZXJlLiBIZW5jZSBwb3N0aW5nIHdoYXQgSSBoYXZlIHRvIGEgd2lkZXIgYXVkaWVuY2UuCgpK
b2huIEhhcnJpc29uICgyKToKICBkcm0vaTkxNTogRXh0ZW5kIEd1QyBhY3Rpb24gZmFzdCBzcGlu
IHRpbWUKICBkcm0vaTkxNTogQXZvaWQgc3RhbGxpbmcgb24gR3VDIHNlbmQgbXV0ZXggbG9jawoK
IGRyaXZlcnMvZ3B1L2RybS9pOTE1L2k5MTVfZ3VjX3N1Ym1pc3Npb24uYyB8IDEyICsrKysrKy0t
LS0tLQogZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfZ3VjX2xvZy5jICAgICAgIHwgIDYgKysr
LS0tCiBkcml2ZXJzL2dwdS9kcm0vaTkxNS9pbnRlbF9odWMuYyAgICAgICAgICAgfCAgMiArLQog
ZHJpdmVycy9ncHUvZHJtL2k5MTUvaW50ZWxfdWMuYyAgICAgICAgICAgIHwgMjMgKysrKysrKysr
KysrKysrKysrLS0tLS0KIGRyaXZlcnMvZ3B1L2RybS9pOTE1L2ludGVsX3VjLmggICAgICAgICAg
ICB8ICAyICstCiA1IGZpbGVzIGNoYW5nZWQsIDI5IGluc2VydGlvbnMoKyksIDE2IGRlbGV0aW9u
cygtKQoKLS0gCjIuMTMuMAoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f
X19fX19fX18KSW50ZWwtZ2Z4IG1haWxpbmcgbGlzdApJbnRlbC1nZnhAbGlzdHMuZnJlZWRlc2t0
b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vaW50
ZWwtZ2Z4Cg==