Date: Sat, 2 Oct 2010 12:51:09 +1000 From: Sean <sean@gothic.net.au> To: Artem Belevich <fbsdlist@src.cx> Cc: freebsd-stable <freebsd-stable@freebsd.org>, Dan Langille <dan@langille.org> Subject: Re: zfs send/receive: is this slow? Message-ID: <E97572BA-F9A1-409F-8427-800B7D22AB8C@gothic.net.au> In-Reply-To: <AANLkTi=xnOmRXYgr8csy-tTa-GK%2B3V4Ty2ze0fruPQb4@mail.gmail.com> References: <a263c3beaeb0fa3acd82650775e31ee3.squirrel@nyi.unixathome.org> <45cfd27021fb93f9b0877a1596089776.squirrel@nyi.unixathome.org> <AANLkTik0aTDDSNRUBvfX5sMfhW%2B-nfSV9Q89v%2BeJo0ov@mail.gmail.com> <4C511EF8-591C-4BB9-B7AA-30D5C3DDC0FF@langille.org> <AANLkTinyHZ1r39AYrV_Wwc2H3B=xMv3vbeDLY2Gc%2Bkez@mail.gmail.com> <4CA68BBD.6060601@langille.org> <AANLkTi=xnOmRXYgr8csy-tTa-GK%2B3V4Ty2ze0fruPQb4@mail.gmail.com>
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On 02/10/2010, at 11:43 AM, Artem Belevich wrote: >> As soon as I opened this email I knew what it would say. >>=20 >>=20 >> # time zfs send storage/bacula@transfer | mbuffer | zfs receive >> storage/compressed/bacula-mbuffer >> in @ 197 MB/s, out @ 205 MB/s, 1749 MB total, buffer 0% full > .. >> Big difference. :) >=20 > I'm glad it helped. >=20 > Does anyone know why sending/receiving stuff via loopback is so much > slower compared to pipe? Up and down the entire network stack, in and out of TCP buffers at both = ends... might add some overhead, and other factors in limiting it. Increasing TCP buffers, and disabling delayed acks might help. Nagle = might also have to be disabled too. (delayed acks and nagle in = combination can interact in odd ways) >=20 > --Artem > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to = "freebsd-stable-unsubscribe@freebsd.org"
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