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Tue, 12 Aug 2025 07:53:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B358C4CEF0; Tue, 12 Aug 2025 07:53:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754985239; bh=sw8wLAIZdKxUOMDtddxEFYfkLyHWxf/hNcZfBt9jddc=; h=Date:Cc:Subject:To:References:From:In-Reply-To:From; b=jh3uStF3r13oKRFs0sLYrM2446Mi+VB8hpHKE9Zh83l99O+usPogtPFDkMn9Q5GM1 ulEPEVxJhe/iJdSxhpCcEs7THsZMAfxFmWt0cASdTay3BP6NgUC5bXq3e2Rj5NUrH3 AGUweTGCW+hwhMuQ9gFmRjR9UW5kyJq9d1bhq5qBCtDVf150CeQW15gSD+CjZxwgWg U4heXQ0DgqonUyh78GfP/hhONpJOUWjPBxp1Gl0afR5DNOMx7QCTJT0ecG+2n5k9EB zJS5Y+vwsB//qSKw/W1Zb4OfmVnzGQiXWwtqp5AciGajSdR1iXRJwT6y+ZMP7hxh/Q DEBA8uRrQMeEQ== Message-ID: Date: Tue, 12 Aug 2025 15:53:54 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Christoph Hellwig References: <20250807034838.3829794-1-chao@kernel.org> Content-Language: en-US In-Reply-To: X-Headers-End: 1uljph-0003Ux-WA Subject: Re: [f2fs-dev] [PATCH v3] f2fs: introduce flush_policy sysfs entry X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Chao Yu via Linux-f2fs-devel Reply-To: Chao Yu Cc: linux-block@vger.kernel.org, jaegeuk@kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 8/12/25 15:32, Christoph Hellwig wrote: > On Tue, Aug 12, 2025 at 02:28:46PM +0800, Chao Yu wrote: >> BTW, I suffered extremely long latency of checkpoint which may block every >> update operations when testing generic/299 w/ mode=lfs mount option in qemu, >> then I propose to use PREFLUSH instead of FUA to resolve this issue. >> >> "F2FS-fs (vdc): checkpoint was blocked for 24495 ms" >> >> I just realize that using cache=directsync option in qemu can avoid FUA hang >> issue, anyway, let me test more w/ this option. > > Well, for decent qemu performance you always want to use DIRECT I/O. > directsync is generally not a very good idea as it forces every write > to be synchronous and will give you very bad performance. Yeah, I think that may hurt the performance too, at least, I don't see any obvious change for time cost of generic/299 testcases, but still I need to run all my testcase to see what will happen. :) generic/299 115s ... 113s > > What did you use before? At least for older qemu the default was > buffered I/O, which can lead to very expensive fua or flush calls. Previously, I didn't use any cache= option, as manual described, it should equal to cache=wrteback. Thanks, _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel