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Date:      Fri, 1 Oct 2010 21:31:24 -0500
From:      Brandon Gooch <jamesbrandongooch@gmail.com>
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:  <AANLkTimtpVcXsd2SyhQDcedrk_PAkxjiJwtT%2BfbuEMO3@mail.gmail.com>
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 Fri, Oct 1, 2010 at 8:43 PM, Artem Belevich <fbsdlist@src.cx> wrote:
>> As soon as I opened this email I knew what it would say.
>>
>>
>> # time zfs send storage/bacula@transfer | mbuffer | zfs receive
>> storage/compressed/bacula-mbuffer
>> in @ =A0197 MB/s, out @ =A0205 MB/s, 1749 MB total, buffer =A0 0% full
> ...
>> Big difference. =A0:)
>
> I'm glad it helped.
>
> Does anyone know why sending/receiving stuff via loopback is so much
> slower compared to pipe?

This may shed some light on that topic:

http://lists.freebsd.org/pipermail/freebsd-current/2010-September/019877.ht=
ml



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