Date: Fri, 14 Oct 2022 10:11:06 +0800 From: Zhenlei Huang <zlei.huang@gmail.com> To: freebsd-hackers@freebsd.org Subject: Fwd: is this FreeBSD problem or HP switch Message-ID: <F3AB6786-920B-4E63-9268-37F097974BC2@gmail.com> References: <7E97376C-7FCC-46E9-9626-A9D260B01793@gmail.com>
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--Apple-Mail=_1B9F8BDB-791D-4B91-BEA9-AD06384BD454 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Sorry for missing CC > Begin forwarded message: >=20 > From: Zhenlei Huang <zlei.huang@gmail.com> > Subject: Re: is this FreeBSD problem or HP switch > Date: October 14, 2022 at 10:08:13 AM GMT+8 > To: Jason Bacon <bacon4000@gmail.com> >=20 >=20 >=20 >> On Oct 14, 2022, at 8:11 AM, Jason Bacon <bacon4000@gmail.com = <mailto:bacon4000@gmail.com>> wrote: >>=20 >> On 10/13/22 17:48, Wojciech Puchar wrote: >>> i have HP-2530-24G switch in home and 3 VLANs. >>> there was no traffic on 2 of them, one vlan have full bandwitch = traffic from computer A to computer B - at 1000Mbit/s >>> At this time ping from computer C to computer A (computer C have = 100Mbit/s card) was random between 1 and 1000ms. >>> Just limiting artifically speed to 950Mbit/s solved the problem. >>> Is this because switch behaves that way or can it be a FreeBSD = problem (all computers runs FreeBSD) >>=20 >> I saw an issue some years ago where one of my FreeBSD servers was = overwhelming a Cisco switch while pushing files out to HTCondor nodes, = causing it to drop packets. Our networks guru confirmed the problem by = monitoring the switch. Since no handshaking was possible, I worked = around it by throttling the interface on the FreeBSD box, using ipfw if = I recall correctly. >>=20 >> --=20 >> Life is a game. Play hard. Play fair. Have fun. >>=20 >>=20 >=20 >=20 > Modern x86 hardware can easily saturate Gigabit network. Probably it = is not the issue of the box, or the OS ( FreeBSD in the context ). > There's an old post about ICMP packet drops on the HPE community, = https://community.hpe.com/t5/aruba-provision-based/hp-procuvre-2530-icmp-p= acket-lost/td-p/6347333 = <https://community.hpe.com/t5/aruba-provision-based/hp-procuvre-2530-icmp-= packet-lost/td-p/6347333> . Although I can not conclude it is the = problem of switch, but you can try connection the two FreeBSD box = directly with crossover ethernet cable and repeat the test. >=20 > Also the statistics reported by switch / OS are extremely useful in = production ( when excluding some suspicious objects is not an option ). >=20 > Best regards, > Zhenlei --Apple-Mail=_1B9F8BDB-791D-4B91-BEA9-AD06384BD454 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; = charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Sorry= for missing CC<br class=3D""><div><br class=3D""><blockquote = type=3D"cite" class=3D""><div class=3D"">Begin forwarded = message:</div><br class=3D"Apple-interchange-newline"><div = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px;" class=3D""><span style=3D"font-family: = -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; = color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">From: = </b></span><span style=3D"font-family: -webkit-system-font, Helvetica = Neue, Helvetica, sans-serif;" class=3D"">Zhenlei Huang <<a = href=3D"mailto:zlei.huang@gmail.com" = class=3D"">zlei.huang@gmail.com</a>><br class=3D""></span></div><div = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px;" class=3D""><span style=3D"font-family: = -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; = color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Subject: = </b></span><span style=3D"font-family: -webkit-system-font, Helvetica = Neue, Helvetica, sans-serif;" class=3D""><b class=3D"">Re: is this = FreeBSD problem or HP switch</b><br class=3D""></span></div><div = style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; = margin-left: 0px;" class=3D""><span style=3D"font-family: = -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; = color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Date: = </b></span><span style=3D"font-family: -webkit-system-font, Helvetica = Neue, Helvetica, sans-serif;" class=3D"">October 14, 2022 at 10:08:13 AM = GMT+8<br class=3D""></span></div><div style=3D"margin-top: 0px; = margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span= style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, = sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">To: = </b></span><span style=3D"font-family: -webkit-system-font, Helvetica = Neue, Helvetica, sans-serif;" class=3D"">Jason Bacon <<a = href=3D"mailto:bacon4000@gmail.com" = class=3D"">bacon4000@gmail.com</a>><br class=3D""></span></div><br = class=3D""><div class=3D""><meta http-equiv=3D"Content-Type" = content=3D"text/html; charset=3Dus-ascii" class=3D""><div = style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break: = after-white-space;" class=3D""><br class=3D""><div class=3D""><br = class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On Oct = 14, 2022, at 8:11 AM, Jason Bacon <<a = href=3D"mailto:bacon4000@gmail.com" class=3D"">bacon4000@gmail.com</a>>= wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div = class=3D"">On 10/13/22 17:48, Wojciech Puchar wrote:<br = class=3D""><blockquote type=3D"cite" class=3D"">i have HP-2530-24G = switch in home and 3 VLANs.<br class=3D"">there was no traffic on 2 of = them, one vlan have full bandwitch traffic from computer A to computer B = - at 1000Mbit/s<br class=3D"">At this time ping from computer C to = computer A (computer C have 100Mbit/s card) was random between 1 and = 1000ms.<br class=3D"">Just limiting artifically speed to 950Mbit/s = solved the problem.<br class=3D"">Is this because switch behaves that = way or can it be a FreeBSD problem (all computers runs FreeBSD)<br = class=3D""></blockquote><br class=3D"">I saw an issue some years ago = where one of my FreeBSD servers was overwhelming a Cisco switch while = pushing files out to HTCondor nodes, causing it to drop packets. = Our networks guru confirmed the problem by monitoring the switch. = Since no handshaking was possible, I worked around it by = throttling the interface on the FreeBSD box, using ipfw if I recall = correctly.<br class=3D""><br class=3D"">-- <br class=3D"">Life is a = game. Play hard. Play fair. Have fun.<br class=3D""><br = class=3D""><br class=3D""></div></div></blockquote></div><div = class=3D""><br class=3D""></div><div class=3D"">Modern x86 hardware can = easily saturate Gigabit network. Probably it is not the issue of the = box, or the OS ( FreeBSD in the context ).</div><div class=3D"">There's = an old post about ICMP packet drops on the HPE community, <a = href=3D"https://community.hpe.com/t5/aruba-provision-based/hp-procuvre-253= 0-icmp-packet-lost/td-p/6347333" = class=3D"">https://community.hpe.com/t5/aruba-provision-based/hp-procuvre-= 2530-icmp-packet-lost/td-p/6347333</a> . Although I can not = conclude it is the problem of switch, but you can try connection the two = FreeBSD box directly with crossover ethernet cable and repeat the = test.</div><div class=3D""><br class=3D""></div><div class=3D"">Also the = statistics reported by switch / OS are extremely useful in production ( = when excluding some suspicious objects is not an option ).</div><div = class=3D""><br class=3D""></div><div class=3D"">Best regards,</div><div = class=3D"">Zhenlei</div></div></div></blockquote></div><br = class=3D""></body></html>= --Apple-Mail=_1B9F8BDB-791D-4B91-BEA9-AD06384BD454--
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