Date: Thu, 25 Feb 2010 12:32:44 +0200 From: Nikolay Denev <ndenev@gmail.com> To: Harald Schmalzbauer <h.schmalzbauer@OmniLAN.de> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS write stalls (starving reads) and tuning zfs_write_limit_override Message-ID: <1C136B0A-E98F-4F93-8480-7FACD3FE4E4B@gmail.com> In-Reply-To: <4B8649F4.4070303@omnilan.de> References: <4B8649F4.4070303@omnilan.de>
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[-- Attachment #1 --] On Feb 25, 2010, at 11:59 AM, Harald Schmalzbauer wrote: > Hello, > > I found your very interesting patch: http://lists.freebsd.org/pipermail/freebsd-fs/2010-February/007818.html > Unfortunately it seems to be -current since on -stable my dsl_pool.c looks entire different. > My C skills don't allow me to adopt. Do you have any hints for me? > > Thanks, > > -Harry > Hi, What I posted was not a patch, but just the lines need to be added to dsl_pool.c and it should work for either 8 or CURRENT. Here is a patch for 8-STABLE that I just generated, can you try that one (pasting in the email in case the email eats the attachment [-- Attachment #2 --] --- .zfs/snapshot/orig/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c 2009-08-24 07:30:23.677549074 +0300 +++ sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c 2010-02-19 09:17:50.058020997 +0200 @@ -47,6 +47,11 @@ uint64_t zfs_write_limit_override = 0; extern uint64_t zfs_write_limit_min; +SYSCTL_DECL(_vfs_zfs); +TUNABLE_ULONG("vfs.zfs.write_limit_override", &zfs_write_limit_override); +SYSCTL_ULONG(_vfs_zfs, OID_AUTO, zfs_write_limit_override, CTLFLAG_RW, &zfs_write_limit_override, 0, + "Override maximum TXG size"); + kmutex_t zfs_write_limit_lock; static pgcnt_t old_physmem = 0; [-- Attachment #3 --] ): --- .zfs/snapshot/orig/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c 2009-08-24 07:30:23.677549074 +0300 +++ sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_pool.c 2010-02-19 09:17:50.058020997 +0200 @@ -47,6 +47,11 @@ uint64_t zfs_write_limit_override = 0; extern uint64_t zfs_write_limit_min; +SYSCTL_DECL(_vfs_zfs); +TUNABLE_ULONG("vfs.zfs.write_limit_override", &zfs_write_limit_override); +SYSCTL_ULONG(_vfs_zfs, OID_AUTO, zfs_write_limit_override, CTLFLAG_RW, &zfs_write_limit_override, 0, + "Override maximum TXG size"); + kmutex_t zfs_write_limit_lock; static pgcnt_t old_physmem = 0; Regards, Niki Denev
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