From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5AEE5C28CC5 for ; Sat, 8 Jun 2019 08:46:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 36A73212F5 for ; Sat, 8 Jun 2019 08:46:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726736AbfFHIq5 convert rfc822-to-8bit (ORCPT ); Sat, 8 Jun 2019 04:46:57 -0400 Received: from lithops.sigma-star.at ([195.201.40.130]:55018 "EHLO lithops.sigma-star.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726590AbfFHIq5 (ORCPT ); Sat, 8 Jun 2019 04:46:57 -0400 Received: from localhost (localhost [127.0.0.1]) by lithops.sigma-star.at (Postfix) with ESMTP id DC296608310F; Sat, 8 Jun 2019 10:46:54 +0200 (CEST) Received: from lithops.sigma-star.at ([127.0.0.1]) by localhost (lithops.sigma-star.at [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id zvqCvutu62Nr; Sat, 8 Jun 2019 10:46:54 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by lithops.sigma-star.at (Postfix) with ESMTP id A52876083112; Sat, 8 Jun 2019 10:46:54 +0200 (CEST) Received: from lithops.sigma-star.at ([127.0.0.1]) by localhost (lithops.sigma-star.at [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id lDWzSDzz8har; Sat, 8 Jun 2019 10:46:54 +0200 (CEST) Received: from lithops.sigma-star.at (lithops.sigma-star.at [195.201.40.130]) by lithops.sigma-star.at (Postfix) with ESMTP id 85D98608310F; Sat, 8 Jun 2019 10:46:54 +0200 (CEST) Date: Sat, 8 Jun 2019 10:46:54 +0200 (CEST) From: Richard Weinberger To: Emil Lenngren Cc: linux-mtd , Sebastian Andrzej Siewior , linux-kernel , Michele Dionisio Message-ID: <2132182687.85021.1559983614464.JavaMail.zimbra@nod.at> In-Reply-To: References: <20190515210202.21169-1-richard@nod.at> <1644731533.84685.1559938164477.JavaMail.zimbra@nod.at> <1342653998.84700.1559940592644.JavaMail.zimbra@nod.at> Subject: Re: [PATCH] ubifs: Add support for zstd compression. MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT X-Originating-IP: [195.201.40.130] X-Mailer: Zimbra 8.8.8_GA_3025 (ZimbraWebClient - FF60 (Linux)/8.8.8_GA_1703) Thread-Topic: ubifs: Add support for zstd compression. Thread-Index: 1TyPXqVJ7NP9H5VZPOir3EfKZv4bww== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ----- Ursprüngliche Mail ----- > ARM Cortex-A7. The kernel is compiled with gcc 7.3.1. Next week I'll > test some more. Good to know! > I have a question about how the decompression is done while reading. > When a large file is read from the filesystem (assuming not in any > cache), is it the case that first a chunk is read from flash, that > chunk is then decompressed, later next chunk is read from flash, that > one is then decompressed and so on, or can the decompression be done > in parallel while reading the next chunk from flash? No, this is a serial operation. Thanks, //richard