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[23.128.96.33]) by mx.google.com with ESMTPS id u12-20020a17090341cc00b001c5e0672f53si100876ple.466.2023.10.18.08.32.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Oct 2023 08:32:27 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 23.128.96.33 as permitted sender) client-ip=23.128.96.33; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=DyR694x4; spf=pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 23.128.96.33 as permitted sender) smtp.mailfrom=linux-nfs-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by lipwig.vger.email (Postfix) with ESMTP id 59D588063BC5; Wed, 18 Oct 2023 08:32:25 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at lipwig.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231210AbjJRPcO (ORCPT + 99 others); Wed, 18 Oct 2023 11:32:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231472AbjJRPcN (ORCPT ); Wed, 18 Oct 2023 11:32:13 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8AE45118 for ; Wed, 18 Oct 2023 08:31:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1697643085; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=VJjSKfUQTcoC80LPn9xGSAff+OFEbL1iKvizfskLo0U=; b=DyR694x4NM8w/v308o1+BNMMs9XKUoNMyIsG6vf8x7Z/ebTQoyYNAlxotGCakzsYcw+0Gh 8bQyzg+ADrOokxlua750cIeZ91tBLWS5HXioN/c3PMHdu5/n7Lveyi2Xc50HL0XeQB7qtt lNjpUdH7Z8HvzG4j+p9p1DInbpXVqZk= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-517-atLNvQ3-N-eeuDftBtJlhQ-1; Wed, 18 Oct 2023 11:31:09 -0400 X-MC-Unique: atLNvQ3-N-eeuDftBtJlhQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7E71688D012; Wed, 18 Oct 2023 15:31:04 +0000 (UTC) Received: from [192.168.37.1] (unknown [10.22.48.7]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E4809908; Wed, 18 Oct 2023 15:31:03 +0000 (UTC) From: Benjamin Coddington To: Charles Hedrick Cc: linux-nfs@vger.kernel.org Subject: Re: bad info in NFS context Date: Wed, 18 Oct 2023 11:31:02 -0400 Message-ID: <0BE81C71-CA47-4BE2-ABE7-FEEF2206EFD6@redhat.com> In-Reply-To: References: <650954F9-F67D-4F62-AD7B-4D16DF45E168@redhat.com> <7B541D75-296B-4264-92BC-6154B84F2557@redhat.com> MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.1 X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Wed, 18 Oct 2023 08:32:25 -0700 (PDT) On 18 Oct 2023, at 11:18, Charles Hedrick wrote: > Ubuntu added fasc, but it's a kernel parameter. It can be changed without > a reboot, so we were able to fix the problem. It appears that this has > become the default upstream. I looked at Ubuntu's kernel code for their > next LTS, and it looks like they've accepted the upstream code, so the > problem shouldn't occur in the next LTS. Meanwhile we've taken precautions > to set the option on all our systems. I'm surprised - I haven't seen any "fasc" mount option go upstream. Where did you see the upstream work? I'll probably hack up a patch to dump the access cache via sysfs file and send that sometime this week, I can copy you if you have interest. I'm thinking usage would look something like: echo > /sys/fs/nfs/0\:57/drop_access_cache Ben