From owner-svn-src-stable-10@freebsd.org Mon Jan 11 17:24:20 2016 Return-Path: Delivered-To: svn-src-stable-10@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 5C217A65828; Mon, 11 Jan 2016 17:24:20 +0000 (UTC) (envelope-from jimharris@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 12DDB1E13; Mon, 11 Jan 2016 17:24:20 +0000 (UTC) (envelope-from jimharris@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u0BHOJYV029748; Mon, 11 Jan 2016 17:24:19 GMT (envelope-from jimharris@FreeBSD.org) Received: (from jimharris@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id u0BHOJSd029747; Mon, 11 Jan 2016 17:24:19 GMT (envelope-from jimharris@FreeBSD.org) Message-Id: <201601111724.u0BHOJSd029747@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: jimharris set sender to jimharris@FreeBSD.org using -f From: Jim Harris Date: Mon, 11 Jan 2016 17:24:19 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r293666 - stable/10/sys/dev/nvd X-SVN-Group: stable-10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-10@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: SVN commit messages for only the 10-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Jan 2016 17:24:20 -0000 Author: jimharris Date: Mon Jan 11 17:24:18 2016 New Revision: 293666 URL: https://svnweb.freebsd.org/changeset/base/293666 Log: MFC r293323: nvd: submit bios directly when BIO_ORDERED not set or in flight This significantly improves parallelism in the most common case. The taskqueue is still used whenever BIO_ORDERED bios are in flight. This patch is based heavily on a patch from gallatin@. Modified: stable/10/sys/dev/nvd/nvd.c Modified: stable/10/sys/dev/nvd/nvd.c ============================================================================== --- stable/10/sys/dev/nvd/nvd.c Mon Jan 11 17:22:57 2016 (r293665) +++ stable/10/sys/dev/nvd/nvd.c Mon Jan 11 17:24:18 2016 (r293666) @@ -73,6 +73,7 @@ struct nvd_disk { struct nvme_namespace *ns; uint32_t cur_depth; + uint32_t ordered_in_flight; TAILQ_ENTRY(nvd_disk) global_tailq; TAILQ_ENTRY(nvd_disk) ctrlr_tailq; @@ -160,6 +161,8 @@ nvd_bio_submit(struct nvd_disk *ndisk, s err = nvme_ns_bio_process(ndisk->ns, bp, nvd_done); if (err) { atomic_add_int(&ndisk->cur_depth, -1); + if (__predict_false(bp->bio_flags & BIO_ORDERED)) + atomic_add_int(&ndisk->ordered_in_flight, -1); bp->bio_error = err; bp->bio_flags |= BIO_ERROR; bp->bio_resid = bp->bio_bcount; @@ -177,6 +180,18 @@ nvd_strategy(struct bio *bp) ndisk = (struct nvd_disk *)bp->bio_disk->d_drv1; + if (__predict_false(bp->bio_flags & BIO_ORDERED)) + atomic_add_int(&ndisk->ordered_in_flight, 1); + + if (__predict_true(ndisk->ordered_in_flight == 0)) { + nvd_bio_submit(ndisk, bp); + return; + } + + /* + * There are ordered bios in flight, so we need to submit + * bios through the task queue to enforce ordering. + */ mtx_lock(&ndisk->bioqlock); bioq_insert_tail(&ndisk->bioq, bp); mtx_unlock(&ndisk->bioqlock); @@ -208,6 +223,8 @@ nvd_done(void *arg, const struct nvme_co ndisk = bp->bio_disk->d_drv1; atomic_add_int(&ndisk->cur_depth, -1); + if (__predict_false(bp->bio_flags & BIO_ORDERED)) + atomic_add_int(&ndisk->ordered_in_flight, -1); biodone(bp); } @@ -316,6 +333,7 @@ nvd_new_disk(struct nvme_namespace *ns, ndisk->ns = ns; ndisk->disk = disk; ndisk->cur_depth = 0; + ndisk->ordered_in_flight = 0; mtx_init(&ndisk->bioqlock, "NVD bioq lock", NULL, MTX_DEF); bioq_init(&ndisk->bioq);