Date: Wed, 30 May 2007 20:17:30 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: freebsd-current@freebsd.org Cc: pyunyh@gmail.com Subject: Re: CFT: re(4) Message-ID: <20070530201730.09d3f460@localhost> In-Reply-To: <20070529121837.GA12808@cdnetworks.co.kr> References: <20070529121837.GA12808@cdnetworks.co.kr>
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Pyun YongHyeon <pyunyh@gmail.com> wrote:
> I've committed a fix for bus_dma(9) bug which resulted in poor Tx
> performance on TSO enabled re(4) driver. With the fix and revised
> re(4) I got more sane performance on re(4). Because there are too many
> hardwares that rely on re(4) I'd like to hear any success or failure
> reports before revised re(4) hits the tree.
With:
fk@africanqueen ~ $pciconf -lv | grep -A 4 ^re=20
re0@pci0:9:0: class=3D0x020000 card=3D0x816910ec chip=3D0x816910ec rev=3D=
0x10 hdr=3D0x00
vendor =3D 'Realtek Semiconductor'
device =3D 'RTL8110SB Single-Chip Gigabit LOM Ethernet Controller'
class =3D network
subclass =3D ethernet
and netserver running on the host with re(4),
and netperf running on a system with em(4)
and FreeBSD 6.2-STABLE, I got:
With TSO4 disabled:
Stock re(4):
65536 32768 32768 10.00 461.63 =20
65536 32768 32768 10.01 459.43 =20
65536 32768 32768 10.01 460.71=20
Patched re(4):
65536 32768 32768 10.00 459.92 =20
65536 32768 32768 10.01 461.14 =20
65536 32768 32768 10.01 460.54
With TSO4 enabled:
Stock re(4):
65536 32768 32768 10.00 460.12 =20
65536 32768 32768 10.00 460.32 =20
65536 32768 32768 10.01 461.89
Patched re(4):
65536 32768 32768 10.01 459.97
65536 32768 32768 10.01 459.27 =20
65536 32768 32768 10.01 459.60
Changing the position of netperf and netserver
(netperf now running on the host with re(4)):
With TSO4 disabled:
Stock re(4):
65536 32768 32768 10.00 326.10 =20
65536 32768 32768 10.00 325.81 =20
65536 32768 32768 10.00 325.75
Patched re(4):
65536 32768 32768 10.00 325.89 =20
65536 32768 32768 10.00 327.28 =20
65536 32768 32768 10.00 328.06
With TSO4 enabled:
Stock re(4):
65536 32768 32768 10.00 326.64 =20
65536 32768 32768 10.00 326.46 =20
65536 32768 32768 10.00 326.41
Patched re(4):
65536 32768 32768 10.00 328.22 =20
65536 32768 32768 10.00 328.03 =20
65536 32768 32768 10.00 328.41
During the tests with the stock re(4) I got
"re0: can't map defragmented mbuf (error 0)"
four times. I didn't get any warnings with
the patched one.
em(4) was running with standard options all the time.
re0 is compiled into the kernel and I had
to reboot between the test triples.
Fabian
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