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Mon, 14 Nov 2022 14:47:35 +0000 (GMT) Received: from [9.163.90.158] (unknown [9.163.90.158]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 14 Nov 2022 14:47:35 +0000 (GMT) Message-ID: <5b59b7df-d2ec-1664-f0fb-764c9b93417c@linux.ibm.com> Date: Mon, 14 Nov 2022 20:17:33 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.1 Subject: Re: [RFC PATCH 0/3] enable bpf_prog_pack allocator for powerpc Content-Language: en-US To: Christophe Leroy , linuxppc-dev , "bpf@vger.kernel.org" References: <20221110184303.393179-1-hbathini@linux.ibm.com> <00efe9b1-d9fd-441c-9eb4-cbf25d82baf2@csgroup.eu> From: Hari Bathini In-Reply-To: <00efe9b1-d9fd-441c-9eb4-cbf25d82baf2@csgroup.eu> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: bi3vyvRwPIOVRHzXkZKMZVoheG3BAfsb X-Proofpoint-GUID: bi3vyvRwPIOVRHzXkZKMZVoheG3BAfsb X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-14_12,2022-11-11_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 suspectscore=0 impostorscore=0 adultscore=0 clxscore=1011 lowpriorityscore=0 spamscore=0 priorityscore=1501 mlxscore=0 bulkscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211140103 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Naveen N. Rao" , Song Liu , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Hi Christophe, On 11/11/22 4:55 pm, Christophe Leroy wrote: > Le 10/11/2022 à 19:43, Hari Bathini a écrit : >> Most BPF programs are small, but they consume a page each. For systems >> with busy traffic and many BPF programs, this may also add significant >> pressure on instruction TLB. High iTLB pressure usually slows down the >> whole system causing visible performance degradation for production >> workloads. >> >> bpf_prog_pack, a customized allocator that packs multiple bpf programs >> into preallocated memory chunks, was proposed [1] to address it. This >> series extends this support on powerpc. >> >> Patches 1 & 2 add the arch specific functions needed to support this >> feature. Patch 3 enables the support for powerpc. The last patch >> ensures cleanup is handled racefully. >> >> Tested the changes successfully on a PowerVM. patch_instruction(), >> needed for bpf_arch_text_copy(), is failing for ppc32. Debugging it. >> Posting the patches in the meanwhile for feedback on these changes. > > I did a quick test on ppc32, I don't get such a problem, only something > wrong in the dump print as traps intructions only are dumped, but > tcpdump works as expected: Thanks for the quick test. Could you please share the config you used. I am probably missing a few knobs in my conifg... Thanks Hari