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Tue, 30 Dec 2025 21:47:55 -0800 (PST) Message-ID: <48548c462733962bf415a568f52bb312af0ee1b2.camel@gmail.com> Subject: Re: [PATCH bpf-next] verifier: add prune points to live registers print From: Eduard Zingerman To: Alexei Starovoitov Cc: Mahe Tardy , bpf , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Paul Chaignon , Shung-Hsi Yu Date: Tue, 30 Dec 2025 21:47:53 -0800 In-Reply-To: References: <20251222185813.150505-1-mahe.tardy@gmail.com> <4eec6b7605d007c6f906bf9a4cd95f2423781b0a.camel@gmail.com> <62ba00524aa7afd5e1f76a5a2f4c06899bf2dd64.camel@gmail.com> <95c33c1d3dc961011ce91411ccb0682323d0f407.camel@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-12-30 at 17:11 -0800, Alexei Starovoitov wrote: > On Tue, Dec 30, 2025 at 10:44=E2=80=AFAM Eduard Zingerman wrote: > >=20 > > >=20 > > > that will make post processing easier, but print on every miss > > > will greatly increase log_level=3D2 size, right ? > >=20 > > Here are some stats for pyperf180: > >=20 > > > Experiment | Log | Log | > > > Kind | Lines | Size | > > > ---------------------------------------------+-------+------| > > > Print cache hits, misses and diffing values | 626K | 88M | > > > Print cache misses and diffing values | 618K | 88M | > > > Print cache misses | 618K | 87M | > > > Default level 2 log | 577K | 85M | >=20 > hmm. That's not that much. > Then I don't understand why you said: > "slows down log level 2 output significantly (~5 times)" >=20 > If the total output is roughly the same, how come it's 5 times slower?? That's an interesting question. Double checked the log for the failing program I was debugging (internal, hits 1M limit): 6M lines total, 1.4M lines are "cache ...", so 20% instead of 8% for pyperf180. Still does not explain the performance difference. I'll check what happens using profiler.