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Tue, 31 Mar 2026 00:37:33 -0700 (PDT) Received: from google.com ([2a00:79e0:2031:6:90ef:61f3:1679:56f5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b242690e60sm102404315ad.37.2026.03.31.00.37.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Mar 2026 00:37:33 -0700 (PDT) Date: Tue, 31 Mar 2026 16:37:29 +0900 From: Sergey Senozhatsky To: Qu Wenruo Cc: Sergey Senozhatsky , Andrew Morton , Minchan Kim , Brian Geffon , linux-block@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig Subject: Re: [PATCH] zram: do not forget to endio for partial discard requests Message-ID: References: <20260331071537.706139-1-senozhatsky@chromium.org> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On (26/03/31 18:02), Qu Wenruo wrote: [..] > Which is 3 times slower than regular block devices. > > And after that short fsstress run: > > NAME ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT > /dev/zram0 zstd 1G 271.2M 10M 20.4M > > I guess this time the overhead is just in the compression so that's > something expected? Yes, pretty sure that is compression overhead, zstd is not the fastest algorithm. If you need something just for testing then lzo or lz4 should be a better choice.