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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[-- Attachment #1 --] Sorry for missing CC > Begin forwarded message: > > 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> > > > >> On Oct 14, 2022, at 8:11 AM, Jason Bacon <bacon4000@gmail.com <mailto:bacon4000@gmail.com>> wrote: >> >> 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) >> >> 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. >> >> -- >> Life is a game. Play hard. Play fair. Have fun. >> >> > > > 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-packet-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. > > Also the statistics reported by switch / OS are extremely useful in production ( when excluding some suspicious objects is not an option ). > > Best regards, > Zhenlei [-- Attachment #2 --] <html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Sorry for missing CC<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">Begin forwarded message:</div><br class="Apple-interchange-newline"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Zhenlei Huang <<a href="mailto:zlei.huang@gmail.com" class="">zlei.huang@gmail.com</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">Re: is this FreeBSD problem or HP switch</b><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">October 14, 2022 at 10:08:13 AM GMT+8<br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">To: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Jason Bacon <<a href="mailto:bacon4000@gmail.com" class="">bacon4000@gmail.com</a>><br class=""></span></div><br class=""><div class=""><meta http-equiv="Content-Type" content="text/html; charset=us-ascii" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Oct 14, 2022, at 8:11 AM, Jason Bacon <<a href="mailto:bacon4000@gmail.com" class="">bacon4000@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On 10/13/22 17:48, Wojciech Puchar wrote:<br class=""><blockquote type="cite" class="">i have HP-2530-24G switch in home and 3 VLANs.<br class="">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="">At this time ping from computer C to computer A (computer C have 100Mbit/s card) was random between 1 and 1000ms.<br class="">Just limiting artifically speed to 950Mbit/s solved the problem.<br class="">Is this because switch behaves that way or can it be a FreeBSD problem (all computers runs FreeBSD)<br class=""></blockquote><br class="">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=""><br class="">-- <br class="">Life is a game. Play hard. Play fair. Have fun.<br class=""><br class=""><br class=""></div></div></blockquote></div><div class=""><br class=""></div><div class="">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="">There's an old post about ICMP packet drops on the HPE community, <a href="https://community.hpe.com/t5/aruba-provision-based/hp-procuvre-2530-icmp-packet-lost/td-p/6347333" class="">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=""><br class=""></div><div class="">Also the statistics reported by switch / OS are extremely useful in production ( when excluding some suspicious objects is not an option ).</div><div class=""><br class=""></div><div class="">Best regards,</div><div class="">Zhenlei</div></div></div></blockquote></div><br class=""></body></html>
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