From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikola Ciprich Subject: 4.4.0 - e1000e - possible power management issue Date: Tue, 19 Apr 2016 21:53:44 +0200 Message-ID: <20160419195344.GA8663@nik-comp.linuxbox.cz> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="TB36FDmn/VVEgNH/" Cc: nikola.ciprich@linuxbox.cz To: netdev@vger.kernel.org Return-path: Received: from gwu.lbox.cz ([62.245.111.132]:45222 "EHLO gwu.lbox.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753839AbcDSUUB (ORCPT ); Tue, 19 Apr 2016 16:20:01 -0400 Received: from linuxbox.linuxbox.cz (linuxbox.linuxbox.cz [10.76.66.10]) by gwu.lbox.cz (Sendmail) with ESMTPS id u3JJri4t018806 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Tue, 19 Apr 2016 21:53:44 +0200 Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: --TB36FDmn/VVEgNH/ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, after upgrading our firewall from 4.1.17 to 4.4.0, we've noticed quite a pe= rformance drop.. Slight network load seems to cause high CPU load.. running perf of almost idle system shows: samples pcnt function DSO _______ _____ _______________________________________ ________= ___________________________________________________________________ 631.00 20.7% e1000_power_down_phy_copper_80003es2lan /lib/mod= ules/4.4.0lb6.01/kernel/drivers/net/ethernet/intel/e1000e/e1000e.ko 191.00 6.3% do_raw_spin_lock [kernel.= kallsyms] =20 165.00 5.4% ipt_register_table /lib/mod= ules/4.4.0lb6.01/kernel/net/ipv4/netfilter/ip_tables.ko =20 119.00 3.9% cache_init /usr/sbi= n/netstat-probe =20 118.00 3.9% __memset_sse2 /lib64/l= ibc-2.12.so =20 88.00 2.9% cache_write_packet /usr/sbi= n/netstat-probe =20 41.00 1.3% __fget [kernel.= kallsyms] =20 40.00 1.3% memcpy [kernel.= kallsyms] =20 when there is some network traffic, e1000_power_down_phy_copper_80003es2lan= jumps to much higher numbers.. as far as I understand the code, this seems suspicious to me.. Anyone hit the same problem? I can try upgrading to 4.4.8-rc1 tomorrow or reverting to 4.1.17 lspci of the box adapters: 05:00.0 Ethernet controller: Intel Corporation 82573E Gigabit Ethernet Cont= roller (Copper) (rev 03) 07:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Cont= roller 09:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Cont= roller 0b:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Cont= roller BR nik --=20 ------------------------------------- Ing. Nikola CIPRICH LinuxBox.cz, s.r.o. 28. rijna 168, 709 00 Ostrava tel.: +420 591 166 214 fax: +420 596 621 273 mobil: +420 777 093 799 www.linuxbox.cz mobil servis: +420 737 238 656 email servis: servis@linuxbox.cz ------------------------------------- --TB36FDmn/VVEgNH/ Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) iEYEARECAAYFAlcWjMgACgkQ3xdJJrLygV7j9QCfQRuXCmTZfcdcGMR22OlRvxyW TUEAoMZ7lh/plmA97BafsGTHxT8kv0dn =Y9PN -----END PGP SIGNATURE----- --TB36FDmn/VVEgNH/--