Date: Mon, 23 Jun 2014 15:50:07 -0400 From: Mike Tancsa <mike@sentex.net> To: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: nfs slowdown (RELENG_8) Message-ID: <53A884EF.2020900@sentex.net>
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I havent started the process of narrowing down where the issue might be
or even if there is an issue, but has anyone else seen a situation where
RELENG_8 i386 nfs client write speed have all of a sudden nose dived ?
Doing a simple cat /dev/zero > /mnt/junk used to yield 500Mb and above
easily. Now, its down to 25Mb. A RELENG_9 client is able to write to
the same NFS server at 900Mb. I tested another i386 RELENG_8 server
with a similar build date and it gets the same slow speed, where as I am
pretty sure the same test gave around 400Mb with an older kernel. Both
problem boxes are i386 at r267114 (~ June 5th). Both have em nics, but
they are different em NICs. But, I have some other boxes from around the
same time that are just as fast, but with different em nics / chipsets
as well so I am not sure if its related to the em driver or not.
The problematic em nics are
em1@pci0:4:0:0: class=0x020000 card=0x35788086 chip=0x10d38086 rev=0x00
hdr=0x00
vendor = 'Intel Corporation'
device = 'Intel 82574L Gigabit Ethernet Controller (82574L)'
class = network
subclass = ethernet
cap 01[c8] = powerspec 2 supports D0 D3 current D0
cap 05[d0] = MSI supports 1 message, 64 bit
cap 10[e0] = PCI-Express 1 endpoint max data 128(256) link x1(x1)
speed 2.5(2.5) ASPM disabled(L0s/L1)
cap 11[a0] = MSI-X supports 5 messages in map 0x1c enabled
and
em1@pci0:6:5:0: class=0x020000 card=0x348d8086 chip=0x10768086 rev=0x05
hdr=0x00
vendor = 'Intel Corporation'
device = 'Gigabit Ethernet Controller (82541EI)'
class = network
subclass = ethernet
bar [10] = type Memory, range 32, base 0xea020000, size 131072,
enabled
bar [14] = type Memory, range 32, base 0xea000000, size 131072,
enabled
bar [18] = type I/O Port, range 32, base 0x1100, size 64, enabled
cap 01[dc] = powerspec 2 supports D0 D3 current D0
cap 07[e4] = PCI-X supports 2048 burst read, 1 split transaction
And ones that are working as expected
em1@pci0:14:0:0: class=0x020000 card=0x109a15d9 chip=0x109a8086
rev=0x00 hdr=0x00
vendor = 'Intel Corporation'
device = 'Intel PRO/1000 PL Network Adaptor (82573L)'
class = network
subclass = ethernet
bar [10] = type Memory, range 32, base 0xe8b00000, size 131072,
enabled
bar [18] = type I/O Port, range 32, base 0x6000, size 32, enabled
cap 01[c8] = powerspec 2 supports D0 D3 current D0
cap 05[d0] = MSI supports 1 message, 64 bit enabled with 1 message
cap 10[e0] = PCI-Express 1 endpoint max data 128(256) link x1(x1)
speed 2.5(2.5)
ecap 0001[100] = AER 1 0 fatal 1 non-fatal 0 corrected
ecap 0003[140] = Serial 1 003048ffff9c59f1
and
em1@pci0:14:0:0: class=0x020000 card=0x109a15d9 chip=0x109a8086
rev=0x00 hdr=0x00
vendor = 'Intel Corporation'
device = 'Intel PRO/1000 PL Network Adaptor (82573L)'
class = network
subclass = ethernet
bar [10] = type Memory, range 32, base 0xe1100000, size 131072,
enabled
bar [18] = type I/O Port, range 32, base 0x6000, size 32, enabled
cap 01[c8] = powerspec 2 supports D0 D3 current D0
cap 05[d0] = MSI supports 1 message, 64 bit enabled with 1 message
cap 10[e0] = PCI-Express 1 endpoint max data 128(256) link x1(x1)
speed 2.5(2.5)
ecap 0001[100] = AER 1 0 fatal 1 non-fatal 0 corrected
ecap 0003[140] = Serial 1 003048ffff905219
It might not be an issue with the em driver. Not sure at this point, but
wondering if anyone has noticed any other slow downs with NFS on RELENG_8 ?
---Mike
--
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike@sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada http://www.tancsa.com/
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