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[67.149.105.175]) by smtp.gmail.com with ESMTPSA id x10sm2137600qkf.42.2021.06.10.05.59.22 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Jun 2021 05:59:22 -0700 (PDT) From: Programmingkid Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.40.0.2.32\)) Subject: tb_flush() calls causing long Windows XP boot times Message-Id: Date: Thu, 10 Jun 2021 08:59:20 -0400 To: Richard Henderson , QEMU devel list X-Mailer: Apple Mail (2.3654.40.0.2.32) Received-SPF: pass client-ip=2607:f8b0:4864:20::82e; envelope-from=programmingkidx@gmail.com; helo=mail-qt1-x82e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi Richard, There is a function called breakpoint_invalidate() in cpu.c that calls a = function called tb_flush(). I have determined that this call is being = made over 200,000 times when Windows XP boots. Disabling this function = makes Windows XP boot way faster than before. The time went down from = around 3 minutes to 20 seconds when I applied the patch below.=20 After I applied the patch I ran several tests in my VM's to see if = anything broke. I could not find any problems. Here is the list my VM's = I tested: Mac OS 10.8 in qemu-system-x86_64 Windows 7 in qemu-system-x86_64 Windows XP in qemu-system-i386 Mac OS 10.4 in qemu-system-ppc I would be happy if the patch below was accepted but I would like to = know your thoughts. Thank you. --- cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/cpu.c b/cpu.c index bfbe5a66f9..297c2e4281 100644 --- a/cpu.c +++ b/cpu.c @@ -253,7 +253,7 @@ static void breakpoint_invalidate(CPUState *cpu, = target_ulong pc) * Flush the whole TB cache to force re-translation of such TBs. * This is heavyweight, but we're debugging anyway. */ - tb_flush(cpu); + /* tb_flush(cpu); */ } #endif =20 --=20 2.24.3 (Apple Git-128)