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Fri, 5 Jun 2020 18:36:36 -0400 (EDT) Date: Fri, 5 Jun 2020 15:36:35 -0700 From: Andres Freund To: Jens Axboe Cc: io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org Subject: Re: [PATCHSET v5 0/12] Add support for async buffered reads Message-ID: <20200605223635.6xesl7u4lxszvico@alap3.anarazel.de> References: <20200526195123.29053-1-axboe@kernel.dk> <20200604005916.niy2mejjcsx4sv6t@alap3.anarazel.de> <6eeff14f-befc-a5cc-08da-cb77f811fbdf@kernel.dk> <20200605202028.d57nklzpeolukni7@alap3.anarazel.de> <20200605203613.ogfilu2edcsfpme4@alap3.anarazel.de> <75bfe993-008d-71ce-7637-369f130bd984@kernel.dk> <3539a454-5321-0bdc-b59c-06f60cc64b56@kernel.dk> <34aadc75-5b8a-331e-e149-45e1547b543e@kernel.dk> <20200605223044.tnh7qsox7zg5uk53@alap3.anarazel.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200605223044.tnh7qsox7zg5uk53@alap3.anarazel.de> X-Rspamd-Queue-Id: 3B37510033200 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi, On 2020-06-05 15:30:44 -0700, Andres Freund wrote: > On 2020-06-05 15:21:34 -0600, Jens Axboe wrote: > > >> I can reproduce this, and I see what it is. I'll send out a patch soonish. > > > > > > Thinko, can you try with this on top? > > > > Sorry that was incomplete, please use this one! > > That seems to fix it! Yay. > > > Bulk buffered reads somehow don't quite seem to be performing that well > though, looking into it. Could be on the pg side too. While looking into that, I played with setting /sys//queue/read_ahead_kb to 0 and noticed that seems to result in all/most IO done in workers. Is that to be expected? Greetings, Andres Freund