From owner-svn-src-head@freebsd.org Fri Sep 15 20:16:07 2017 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 582FFE072FF; Fri, 15 Sep 2017 20:16:07 +0000 (UTC) (envelope-from imp@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 235ED770BC; Fri, 15 Sep 2017 20:16:07 +0000 (UTC) (envelope-from imp@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v8FKG6Gb050923; Fri, 15 Sep 2017 20:16:06 GMT (envelope-from imp@FreeBSD.org) Received: (from imp@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v8FKG675050922; Fri, 15 Sep 2017 20:16:06 GMT (envelope-from imp@FreeBSD.org) Message-Id: <201709152016.v8FKG675050922@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: imp set sender to imp@FreeBSD.org using -f From: Warner Losh Date: Fri, 15 Sep 2017 20:16:06 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r323625 - head/sys/cam/nvme X-SVN-Group: head X-SVN-Commit-Author: imp X-SVN-Commit-Paths: head/sys/cam/nvme X-SVN-Commit-Revision: 323625 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Sep 2017 20:16:07 -0000 Author: imp Date: Fri Sep 15 20:16:06 2017 New Revision: 323625 URL: https://svnweb.freebsd.org/changeset/base/323625 Log: Allow multiple TRIMs to be done for nda Don't call cam_iosched_trim_done or cam_iosched_submit_trim for nda since its hardware can handle almost an arbitrary number of TRIMs and we don't have to be careful to only ever do one. Sponsored by: Netflix Modified: head/sys/cam/nvme/nvme_da.c Modified: head/sys/cam/nvme/nvme_da.c ============================================================================== --- head/sys/cam/nvme/nvme_da.c Fri Sep 15 20:15:55 2017 (r323624) +++ head/sys/cam/nvme/nvme_da.c Fri Sep 15 20:16:06 2017 (r323625) @@ -920,7 +920,12 @@ ndastart(struct cam_periph *periph, union ccb *start_c nda_nvme_trim(softc, &start_ccb->nvmeio, dsm_range, 1); start_ccb->ccb_h.ccb_state = NDA_CCB_TRIM; start_ccb->ccb_h.flags |= CAM_UNLOCKED; - cam_iosched_submit_trim(softc->cam_iosched); /* XXX */ + /* + * Note: We can have multiple TRIMs in flight, so we don't call + * cam_iosched_submit_trim(softc->cam_iosched); + * since that forces the I/O scheduler to only schedule one at a time. + * On NVMe drives, this is a performance disaster. + */ goto out; } case BIO_FLUSH: @@ -1013,7 +1018,11 @@ ndadone(struct cam_periph *periph, union ccb *done_ccb TAILQ_INIT(&queue); TAILQ_CONCAT(&queue, &softc->trim_req.bps, bio_queue); #endif - cam_iosched_trim_done(softc->cam_iosched); + /* + * Since we can have multiple trims in flight, we don't + * need to call this here. + * cam_iosched_trim_done(softc->cam_iosched); + */ ndaschedule(periph); cam_periph_unlock(periph); #ifdef notyet