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Wed, 23 Oct 2024 23:52:28 -0700 (PDT) MIME-Version: 1.0 References: <20241023162447.2bf480b4ce590fdeb8b6c52d@linux-foundation.org> <20241024060954.443574-1-jimzhao.ai@gmail.com> <20241023232042.f9373f9f826ceae2a4f4da35@linux-foundation.org> In-Reply-To: <20241023232042.f9373f9f826ceae2a4f4da35@linux-foundation.org> From: jim zhao Date: Thu, 24 Oct 2024 14:52:18 +0800 Message-ID: Subject: Re: [PATCH] mm/page-writeback: Raise wb_thresh to prevent write blocking with strictlimit To: Andrew Morton Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, willy@infradead.org Content-Type: multipart/alternative; boundary="00000000000024b9cc062533728c" X-Rspamd-Queue-Id: 0BBDF180005 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: nutz9z5jo1iw5p5mf4461peyjymu7zf7 X-HE-Tag: 1729752731-505992 X-HE-Meta: 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 j7P0S/qA 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.449980, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --00000000000024b9cc062533728c Content-Type: text/plain; charset="UTF-8" > Thanks, but it's still unclear how this impacts our users. How lenghty > are these pauses? The length maybe related to device writeback bandwidth. Under normal bandwidth, each pause may last around 4ms and several times as shown in the trace above. In extreme cases, fuse with unstable network backends, if pauses occur frequently and bandwidth is low, each pause can exceed 10ms, the total duration of pauses can accumulate to second. --00000000000024b9cc062533728c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
> Thanks, but it's still unclear how this impacts o= ur users.=C2=A0 How lenghty
> are these pauses?

Th= e length maybe related to device writeback bandwidth.
Under normal band= width, each pause may last around 4ms and several times as shown in the tra= ce above.
In extreme cases, fuse with unstable network backends,
if = pauses occur frequently and bandwidth is low, each pause can exceed 10ms, t= he total duration of pauses can accumulate to second.
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