Date: Fri, 30 Sep 2005 20:59:30 +0200 From: Listas <listas@informatica.info> To: freebsd-current@freebsd.org Subject: Losing ssh session when doing intensive disk I/O & background fsck with RELENG_6 Message-ID: <433D8B12.9020801@informatica.info>
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I'm testing BETA5/RELENG_6 with an Intel P4 system. Here are the essential dmesg fragments with system information: --- ACPI APIC Table: <A M I OEMAPIC > Timecounter "i8254" frequency 1193182 Hz quality 0 CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (3010.67-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0xf34 Stepping = 4 Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> Features2=0x441d<SSE3,RSVD2,MON,DS_CPL,CNTX-ID,<b14>> real memory = 1073414144 (1023 MB) avail memory = 1041526784 (993 MB) ioapic0 <Version 2.0> irqs 0-23 on motherboard [...] xl0: <3Com 3c905B-TX Fast Etherlink XL> port 0xb800-0xb87f mem 0xcddffc00-0xcddffc7f irq 17 at device 9.0 on pci1 miibus0: <MII bus> on xl0 xlphy0: <3Com internal media interface> on miibus0 xlphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto xl0: Ethernet address: 00:01:02:a6:96:37 [...] acd0: DMA limited to UDMA33, controller found non-ATA66 cable acd0: DVDR <HL-DT-ST DVDRAM GSA-4160B/A300> at ata0-master UDMA33 ad8: 194481MB <Maxtor 6B200M0 BANC1980> at ata4-master SATA150 ad8: Intel calc=55e037a4 meta=2af01bd2 ad10: 194481MB <Maxtor 6B200M0 BANC1980> at ata5-master SATA150 ad10: Intel calc=55e037a4 meta=2af01bd2 ar0: 194480MB <Intel MatrixRAID RAID1> status: READY ar0: disk0 READY (master) using ad8 at ata4-master ar0: disk1 READY (mirror) using ad10 at ata5-master Trying to mount root from ufs:/dev/ar0s1a Loading configuration files. No suitable dump device was found. Entropy harvesting: interrupts ethernet point_to_point kickstart . swapon: adding /dev/ar0s1b as swap device --- The boot process is trying to configure the dump device before swapon and it fails, but that's not the real problem I report here. The problem is that when I do some intensive disk I/O (make install, du -ckx /usr, etc.) just after booting, I lose my ssh connection to the machine, and may spend a lot to reconnect. It seems that this only happens while a background fsck is running. I find nothing in /var/log/messages, nor elsewhere. For example, If I do a /usr/bin/du -ckx, it starts really fast, but then becomes slower and slower until the ssh connection is closed. Meanwhile, the console runs just fine. Found the same problem running 'make install', and after the connection was closed the 'make' processes were all in wait state and had to issue a kill -9 to kill them. Tested with BETA5 and RELENG_6 as of today. Regards, Carlos
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