From mboxrd@z Thu Jan 1 00:00:00 1970 From: Coly Li Subject: Re: [PATCH 14/17] bcache: back to cache all readahead I/Os Date: Fri, 24 Jan 2020 01:27:59 +0800 Message-ID: References: <20200123170142.98974-1-colyli@suse.de> <20200123170142.98974-15-colyli@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: Received: from mx2.suse.de ([195.135.220.15]:35730 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727022AbgAWR2F (ORCPT ); Thu, 23 Jan 2020 12:28:05 -0500 In-Reply-To: Content-Language: en-US Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: Michael Lyle Cc: Jens Axboe , linux-bcache , linux-block@vger.kernel.org, stable On 2020/1/24 1:19 上午, Michael Lyle wrote: > Hi Coly and Jens-- > > One concern I have with this is that it's going to wear out > limited-lifetime SSDs a -lot- faster. Was any thought given to making > this a tunable instead of just changing the behavior? Even if we have > an anecdote or two that it seems to have increased performance for > some workloads, I don't expect it will have increased performance in > general and it may even be costly for some workloads (it all comes > down to what is more useful in the cache-- somewhat-recently readahead > data, or the data that it is displacing). Hi Mike, Copied. This is good suggestion, I will do it after I back from Lunar New Year vacation, and submit it with other tested patches in following v5.6-rc versions. Thanks. Coly Li [snipped] -- Coly Li