Date: Sun, 24 Dec 2023 16:31:01 -0700 From: Warner Losh <imp@bsdimp.com> To: void <void@f-m.fm> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: measuring swap partition speed Message-ID: <CANCZdfp8nKTdmT9K6KSVXZR4XWBgP_SRiGTWLSa=KTst%2BJO=dQ@mail.gmail.com> In-Reply-To: <0ac6ceb8-cdf4-49f7-99c3-026a56527fd3@app.fastmail.com> References: <A6B49CB2-2EEC-4F1F-8777-D7EF65C71E5E.ref@yahoo.com> <A6B49CB2-2EEC-4F1F-8777-D7EF65C71E5E@yahoo.com> <2dcc21bb-f446-41fa-871b-2c37cdf9afe0@app.fastmail.com> <CANCZdfpbuOo4qpjifcmq8i8Kz_7a4DWcVNkqJbMEwnkLA-W6Lw@mail.gmail.com> <0ac6ceb8-cdf4-49f7-99c3-026a56527fd3@app.fastmail.com>
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--000000000000473a71060d49d8a2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, Dec 24, 2023, 4:17=E2=80=AFAM void <void@f-m.fm> wrote: > On Sat, 23 Dec 2023, at 21:19, Warner Losh wrote: > > > 5s+ of latency on the average, max latency of 12s! Woof. No wonder you > > hate life. > > LOL! > > Thing is, it's not all the time. But when it happens, it tends to stay > happening, unless something like swapflush runs or if I manually swapoff > then on. > Yea. I think that the swapping tunables may need tweaking... if you must swap. The swapin/swapoff evictions suggest as much. But my fu for that is at least 20 years stale. There may be tuneables in tuning(9) related to vm that might help. Warner > --000000000000473a71060d49d8a2 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"auto"><div><br><br><div class=3D"gmail_quote"><div dir=3D"ltr" = class=3D"gmail_attr">On Sun, Dec 24, 2023, 4:17=E2=80=AFAM void <<a href= =3D"mailto:void@f-m.fm">void@f-m.fm</a>> wrote:<br></div><blockquote cla= ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa= dding-left:1ex">On Sat, 23 Dec 2023, at 21:19, Warner Losh wrote:<br> <br> > 5s+ of latency on the average, max latency of 12s!=C2=A0 Woof. No wond= er you <br> > hate life.<br> <br> LOL!<br> <br> Thing is, it's not all the time. But when it happens, it tends to stay = happening, unless something like swapflush runs or if I manually swapoff th= en on.<br></blockquote></div></div><div dir=3D"auto"><br></div><div dir=3D"= auto">Yea. I think that the swapping tunables may need tweaking... if you m= ust swap. The swapin/swapoff evictions suggest as much. But my fu for that = is at least 20 years stale. There may be tuneables in tuning(9) related to = vm that might help.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Warn= er</div><div dir=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D"g= mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l= eft:1ex"> </blockquote></div></div></div> --000000000000473a71060d49d8a2--
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