| mbuf.9 (72a3951459cd8937c6b6f0b43804c39889c4ae30) | mbuf.9 (c8185672b28957105341b2ce95fd497e209ad64c) |
|---|---|
| 1.\" Copyright (c) 2000 FreeBSD Inc. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 509 unchanged lines hidden (view full) --- 518all but the first 519.Fa len 520bytes. 521In case of failure, it returns 522.Dv NULL 523and attempts to restore the chain to its original state. 524.El 525.Sh STRESS TESTING | 1.\" Copyright (c) 2000 FreeBSD Inc. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 509 unchanged lines hidden (view full) --- 518all but the first 519.Fa len 520bytes. 521In case of failure, it returns 522.Dv NULL 523and attempts to restore the chain to its original state. 524.El 525.Sh STRESS TESTING |
| 526When running a kernel compiled with the option MBUF_STRESS_TEST, 527the following sysctl-controlled options may be used to create 528various failure / extreme cases for testing of network drivers | 526When running a kernel compiled with the option 527.Dv MBUF_STRESS_TEST , 528the following 529.Xr sysctl 8 Ns 530-controlled options may be used to create 531various failure/extreme cases for testing of network drivers |
| 529and other mbuf-reliant parts of the kernel. | 532and other mbuf-reliant parts of the kernel. |
| 530.Pp 531.Va net.inet.ip.mbuf_frag_size 532causes ip_output to fragment outgoing mbuf chains into fragments of 533the specified size. Setting this option to 1 is an excellent way to | 533.Bl -tag -width ident 534.It Va net.inet.ip.mbuf_frag_size 535Causes 536.Fn ip_output 537to fragment outgoing mbuf chains into fragments of the specified size. 538Setting this variable to 1 is an excellent way to |
| 534test the long mbuf chain handling ability of network drivers. | 539test the long mbuf chain handling ability of network drivers. |
| 535.Pp 536.Va kern.ipc.m_defragrandomfailures 537causes the function m_defrag to randomly fail, returning NULL. Any 538piece of code which uses m_defrag should be tested with this feature. | 540.It Va kern.ipc.m_defragrandomfailures 541Causes the function 542.Fn m_defrag 543to randomly fail, returning 544.Dv NULL . 545Any piece of code which uses 546.Fn m_defrag 547should be tested with this feature. 548.El |
| 539.Sh RETURN VALUES 540See above. 541.Sh HISTORY 542.\" Please correct me if I'm wrong 543Mbufs appeared in an early version of 544.Bx . 545Besides for being used for network packets, they were used 546to store various dynamic structures, such as routing table 547entries, interface addresses, protocol control blocks, etc. 548.Sh AUTHORS 549The original 550.Nm 551man page was written by Yar Tikhiy. | 549.Sh RETURN VALUES 550See above. 551.Sh HISTORY 552.\" Please correct me if I'm wrong 553Mbufs appeared in an early version of 554.Bx . 555Besides for being used for network packets, they were used 556to store various dynamic structures, such as routing table 557entries, interface addresses, protocol control blocks, etc. 558.Sh AUTHORS 559The original 560.Nm 561man page was written by Yar Tikhiy. |