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Wysocki" , George Kennedy Subject: Re: slow boot with 7fef431be9c9 ("mm/page_alloc: place pages to tail in __free_pages_core()") Message-ID: References: <0AE49D98-171A-42B9-9CFC-9193A9BD3346@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <0AE49D98-171A-42B9-9CFC-9193A9BD3346@redhat.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-03-13_05:2021-03-12,2021-03-13 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 phishscore=0 spamscore=0 bulkscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 priorityscore=1501 suspectscore=0 impostorscore=0 malwarescore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103130104 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On Sat, Mar 13, 2021 at 10:05:23AM +0100, David Hildenbrand wrote: > > Am 13.03.2021 um 05:04 schrieb Liang, Liang (Leo) : > > > > Hi David, > > > > Which benchmark tool you prefer? Memtest86+ or else? > > Hi Leo, > > I think you want something that runs under Linux natively. > > I‘m planning on coding up a kernel module to walk all 4MB pages in the > freelists and perform a stream benchmark individually. Then we might be > able to identify the problematic range - if there is a problematic range :) My wild guess would be that the pages that are now at the head of free lists have wrong caching enabled. Might be worth checking in your test module. > Guess I‘ll have it running by Monday and let you know. > > Cheers! -- Sincerely yours, Mike.