Date: Fri, 1 Oct 2010 18:49:17 -0400 From: Dan Langille <dan@langille.org> To: Artem Belevich <fbsdlist@src.cx> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: Re: zfs send/receive: is this slow? Message-ID: <4C511EF8-591C-4BB9-B7AA-30D5C3DDC0FF@langille.org> In-Reply-To: <AANLkTik0aTDDSNRUBvfX5sMfhW%2B-nfSV9Q89v%2BeJo0ov@mail.gmail.com> References: <a263c3beaeb0fa3acd82650775e31ee3.squirrel@nyi.unixathome.org> <45cfd27021fb93f9b0877a1596089776.squirrel@nyi.unixathome.org> <AANLkTik0aTDDSNRUBvfX5sMfhW%2B-nfSV9Q89v%2BeJo0ov@mail.gmail.com>
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FYI: this is all on the same box. -- Dan Langille http://langille.org/ On Oct 1, 2010, at 5:56 PM, Artem Belevich <fbsdlist@src.cx> wrote: > Hmm. It did help me a lot when I was replicating ~2TB worth of data > over GigE. Without mbuffer things were roughly in the ballpark of your > numbers. With mbuffer I've got around 100MB/s. > > Assuming that you have two boxes connected via ethernet, it would be > good to check that nobody generates PAUSE frames. Some time back I've > discovered that el-cheapo switch I've been using for some reason could > not keep up with traffic bursts and generated tons of PAUSE frames > that severely limited throughput. > > If you're using Intel adapters, check xon/xoff counters in "sysctl > dev.em.0.mac_stats". If you see them increasing, that may explain slow > speed. > If you have a switch between your boxes, try bypassing it and connect > boxes directly. > > --Artem > > > > On Fri, Oct 1, 2010 at 11:51 AM, Dan Langille <dan@langille.org> wrote: >> >> On Wed, September 29, 2010 2:04 pm, Dan Langille wrote: >>> $ zpool iostat 10 >>> capacity operations bandwidth >>> pool used avail read write read write >>> ---------- ----- ----- ----- ----- ----- ----- >>> storage 7.67T 5.02T 358 38 43.1M 1.96M >>> storage 7.67T 5.02T 317 475 39.4M 30.9M >>> storage 7.67T 5.02T 357 533 44.3M 34.4M >>> storage 7.67T 5.02T 371 556 46.0M 35.8M >>> storage 7.67T 5.02T 313 521 38.9M 28.7M >>> storage 7.67T 5.02T 309 457 38.4M 30.4M >>> storage 7.67T 5.02T 388 589 48.2M 37.8M >>> storage 7.67T 5.02T 377 581 46.8M 36.5M >>> storage 7.67T 5.02T 310 559 38.4M 30.4M >>> storage 7.67T 5.02T 430 611 53.4M 41.3M >> >> Now that I'm using mbuffer: >> >> $ zpool iostat 10 >> capacity operations bandwidth >> pool used avail read write read write >> ---------- ----- ----- ----- ----- ----- ----- >> storage 9.96T 2.73T 2.01K 131 151M 6.72M >> storage 9.96T 2.73T 615 515 76.3M 33.5M >> storage 9.96T 2.73T 360 492 44.7M 33.7M >> storage 9.96T 2.73T 388 554 48.3M 38.4M >> storage 9.96T 2.73T 403 562 50.1M 39.6M >> storage 9.96T 2.73T 313 468 38.9M 28.0M >> storage 9.96T 2.73T 462 677 57.3M 22.4M >> storage 9.96T 2.73T 383 581 47.5M 21.6M >> storage 9.96T 2.72T 142 571 17.7M 15.4M >> storage 9.96T 2.72T 80 598 10.0M 18.8M >> storage 9.96T 2.72T 718 503 89.1M 13.6M >> storage 9.96T 2.72T 594 517 73.8M 14.1M >> storage 9.96T 2.72T 367 528 45.6M 15.1M >> storage 9.96T 2.72T 338 520 41.9M 16.4M >> storage 9.96T 2.72T 348 499 43.3M 21.5M >> storage 9.96T 2.72T 398 553 49.4M 14.4M >> storage 9.96T 2.72T 346 481 43.0M 6.78M >> >> If anything, it's slower. >> >> The above was without -s 128. The following used that setting: >> >> $ zpool iostat 10 >> capacity operations bandwidth >> pool used avail read write read write >> ---------- ----- ----- ----- ----- ----- ----- >> storage 9.78T 2.91T 1.98K 137 149M 6.92M >> storage 9.78T 2.91T 761 577 94.4M 42.6M >> storage 9.78T 2.91T 462 411 57.4M 24.6M >> storage 9.78T 2.91T 492 497 61.1M 27.6M >> storage 9.78T 2.91T 632 446 78.5M 22.5M >> storage 9.78T 2.91T 554 414 68.7M 21.8M >> storage 9.78T 2.91T 459 434 57.0M 31.4M >> storage 9.78T 2.91T 398 570 49.4M 32.7M >> storage 9.78T 2.91T 338 495 41.9M 26.5M >> storage 9.78T 2.91T 358 526 44.5M 33.3M >> storage 9.78T 2.91T 385 555 47.8M 39.8M >> storage 9.78T 2.91T 271 453 33.6M 23.3M >> storage 9.78T 2.91T 270 456 33.5M 28.8M >> >> >> _______________________________________________ >> 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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