From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE3F81F2B8D for ; Tue, 1 Apr 2025 11:20:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743506413; cv=none; b=XmpYyuIeSvXZRyY1FHQ96lMU+6QcBc/VKTMLOs/Mp5hA8VBGG4YuJNxFNYCO2oMAXvPhUcwnGwlXBRYWTyx9pgpFhBd9FuZNv1xiWDwpgPENCIjbLYkPdI7R+ATzJ/W49pnKVNF/1GTQHTtQIrNjhrjHMdU0WAmqXHEifp7nIXU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743506413; c=relaxed/simple; bh=sCjvl7izauThsYwNFbnNKf9NZ42TJuZNSgB3wjxKjJc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=OieCV2Rjf2QVks0FSVPQ8rlpuHEfs50jzukOQh9wJH3DGnnu7D+pB+MLT54gLbFR6Apin7YQXu7nq3bnD5X+fI7z4VCWiMqKChzAHYYuyO8RzfvPA5a6CjndXHN9HdWhhRjbjDuhnFY7Cr8lu7r+SxvfpW1uUNNw63KCuiN5J4I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=BSf8ALRv; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BSf8ALRv" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1743506408; 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=OLK5xMu00RCz/CjhdjrD5oqQm053cd7+2VWl0bjzUcQ=; b=BSf8ALRvy7T4BbCmF3HP2htr4Ei/EU6kCFo18S1HISK7BwZd9mTDpJ3p14xhDNr+pa6s9z 3oJCQmv91ePr3U/CaiYKgIO1socn8tFiMIh4+7oQoB56KVaX+w5xW89YQnlOTaQ91myjWI 6L2c4+PGKos6BPQYpQhaA31Et/wzOok= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-561-rPaSlO7TNKe6qaCGaenIBw-1; Tue, 01 Apr 2025 07:20:05 -0400 X-MC-Unique: rPaSlO7TNKe6qaCGaenIBw-1 X-Mimecast-MFC-AGG-ID: rPaSlO7TNKe6qaCGaenIBw_1743506404 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A69BA180899B; Tue, 1 Apr 2025 11:20:03 +0000 (UTC) Received: from localhost (unknown [10.43.135.229]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 6BF6A1955BEF; Tue, 1 Apr 2025 11:20:00 +0000 (UTC) Date: Tue, 1 Apr 2025 13:19:57 +0200 From: Miroslav Lichvar To: Thomas Gleixner Cc: John Stultz , LKML , Stephen Boyd , Anna-Maria Behnsen , Frederic Weisbecker , Shuah Khan , linux-kselftest@vger.kernel.org, kernel-team@android.com, Lei Chen Subject: Re: [PATCH v2 1/2] time/timekeeping: Fix possible inconsistencies in _COARSE clockids Message-ID: References: <20250320200306.1712599-1-jstultz@google.com> <874izezv3c.ffs@tglx> <87o6xgwftc.ffs@tglx> Precedence: bulk X-Mailing-List: linux-kselftest@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: <87o6xgwftc.ffs@tglx> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 On Tue, Apr 01, 2025 at 08:34:23AM +0200, Thomas Gleixner wrote: > On Mon, Mar 31 2025 at 16:53, Miroslav Lichvar wrote: > > Mult reduction Updates/sec Skew before Skew after > > 16 4 0.004 0.009 > > 16 16 0.011 0.069 > > 16 64 0.020 0.117 > > 64 4 0.013 0.012 > > 64 16 0.030 0.107 > > 64 64 0.058 0.879 > > Hrm. > > Can you try the delta patch below? It seems to improve the worst cases, but overall it's still a regression. Mult reduction Updates/sec Skew 16 4 0.012 16 16 0.014 16 64 0.033 64 4 0.012 64 16 0.105 64 64 0.138 Thanks, -- Miroslav Lichvar